diff --git a/constants.toml b/constants.toml
index b1342c5a82..184c9a880c 100644
--- a/constants.toml
+++ b/constants.toml
@@ -203,6 +203,7 @@ SESSION_REGISTRY_DISCRIMINANT = 19
 BLACKLIST_DISCRIMINANT = 20
 
 # Test modules
+EMPTY_VALUE_SET_MODULE_DISCRIMINANT = 226
 EVENT_EMITTER_MODULE_DISCRIMINANT = 227
 TEST_DEX_DISCRIMINANT = 228
 SEQUENCING_DATA_TESTER_DISCRIMINANT = 229
diff --git a/crates/module-system/sov-modules-api/tests/integration/state_tests/namespaces.rs b/crates/module-system/sov-modules-api/tests/integration/state_tests/namespaces.rs
index 1d8e36146a..c1146e36ba 100644
--- a/crates/module-system/sov-modules-api/tests/integration/state_tests/namespaces.rs
+++ b/crates/module-system/sov-modules-api/tests/integration/state_tests/namespaces.rs
@@ -232,3 +232,145 @@ where
 
     Ok(())
 }
+
+// NOMT requires both user and kernel namespaces to be written together in each
+// commit; a user-only write triggers a harness panic. Mirrors the helper in
+// `structs.rs`.
+fn write_kernel_marker<S: Spec>(state: &mut StateCheckpoint<S>) {
+    let mut kernel_val: KernelStateValue<u8> =
+        KernelStateValue::with_codec(Prefix::new(255, 0), BorshCodec);
+    kernel_val.set(&0u8, state).unwrap();
+}
+
+// The following tests probe the claim that the state backend silently drops
+// zero-byte values on commit, i.e. `StateMap<_, ()>` and `StateValue<()>` appear
+// present in the same session but return `None` after a commit/readback cycle.
+
+#[test]
+fn test_jmt_state_map_unit_value_persists_across_commit() -> Result<(), Infallible> {
+    let mut storage_manager = SimpleJmtStorageManager::new();
+    storage_manager.genesis();
+    test_state_map_unit_value_persists::<TestJmtSpec, _>(storage_manager)
+}
+
+#[test]
+fn test_nomt_state_map_unit_value_persists_across_commit() -> Result<(), Infallible> {
+    let storage_manager = SimpleStorageManager::new();
+    test_state_map_unit_value_persists::<TestSpec, _>(storage_manager)
+}
+
+fn test_state_map_unit_value_persists<S, Sm>(mut storage_manager: Sm) -> Result<(), Infallible>
+where
+    S: Spec,
+    Sm: ForklessStorageManager<Storage = S::Storage>,
+{
+    let (storage, prev_root) = storage_manager.create_storage_with_root();
+    let mut state_map = StateMap::<u32, ()>::with_codec(Prefix::new(0, 0), BorshCodec);
+    let mut kernel = MockKernel::<S>::default();
+
+    let mut state: StateCheckpoint<S> = StateCheckpoint::new(storage.clone(), &kernel, None);
+    state_map.set(&0x12345678u32, &(), &mut state)?;
+    assert_eq!(
+        state_map.get(&0x12345678u32, &mut state)?,
+        Some(()),
+        "StateMap<_, ()> should return Some(()) after set in the same session",
+    );
+    write_kernel_marker(&mut state);
+    commit_to_storage(state, storage, &mut kernel, &mut storage_manager, prev_root);
+
+    let (storage, _) = storage_manager.create_storage_with_root();
+    let mut state: StateCheckpoint<S> = StateCheckpoint::new(storage, &kernel, None);
+    assert_eq!(
+        state_map.get(&0x12345678u32, &mut state)?,
+        Some(()),
+        "StateMap<_, ()> should still return Some(()) after commit + fresh session",
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_jmt_state_map_bool_false_persists_across_commit() -> Result<(), Infallible> {
+    let mut storage_manager = SimpleJmtStorageManager::new();
+    storage_manager.genesis();
+    test_state_map_bool_false_persists::<TestJmtSpec, _>(storage_manager)
+}
+
+#[test]
+fn test_nomt_state_map_bool_false_persists_across_commit() -> Result<(), Infallible> {
+    let storage_manager = SimpleStorageManager::new();
+    test_state_map_bool_false_persists::<TestSpec, _>(storage_manager)
+}
+
+fn test_state_map_bool_false_persists<S, Sm>(mut storage_manager: Sm) -> Result<(), Infallible>
+where
+    S: Spec,
+    Sm: ForklessStorageManager<Storage = S::Storage>,
+{
+    let (storage, prev_root) = storage_manager.create_storage_with_root();
+    let mut state_map = StateMap::<u32, bool>::with_codec(Prefix::new(0, 0), BorshCodec);
+    let mut kernel = MockKernel::<S>::default();
+
+    let mut state: StateCheckpoint<S> = StateCheckpoint::new(storage.clone(), &kernel, None);
+    state_map.set(&0x12345678u32, &false, &mut state)?;
+    assert_eq!(
+        state_map.get(&0x12345678u32, &mut state)?,
+        Some(false),
+        "StateMap<_, bool> should return Some(false) after set in the same session",
+    );
+    write_kernel_marker(&mut state);
+    commit_to_storage(state, storage, &mut kernel, &mut storage_manager, prev_root);
+
+    let (storage, _) = storage_manager.create_storage_with_root();
+    let mut state: StateCheckpoint<S> = StateCheckpoint::new(storage, &kernel, None);
+    assert_eq!(
+        state_map.get(&0x12345678u32, &mut state)?,
+        Some(false),
+        "StateMap<_, bool> control: Some(false) must persist across commit (harness sanity)",
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_jmt_state_value_unit_persists_across_commit() -> Result<(), Infallible> {
+    let mut storage_manager = SimpleJmtStorageManager::new();
+    storage_manager.genesis();
+    test_state_value_unit_persists::<TestJmtSpec, _>(storage_manager)
+}
+
+#[test]
+fn test_nomt_state_value_unit_persists_across_commit() -> Result<(), Infallible> {
+    let storage_manager = SimpleStorageManager::new();
+    test_state_value_unit_persists::<TestSpec, _>(storage_manager)
+}
+
+fn test_state_value_unit_persists<S, Sm>(mut storage_manager: Sm) -> Result<(), Infallible>
+where
+    S: Spec,
+    Sm: ForklessStorageManager<Storage = S::Storage>,
+{
+    let (storage, prev_root) = storage_manager.create_storage_with_root();
+    let mut state_value = StateValue::<()>::with_codec(Prefix::new(0, 0), BorshCodec);
+    let mut kernel = MockKernel::<S>::default();
+
+    let mut state: StateCheckpoint<S> = StateCheckpoint::new(storage.clone(), &kernel, None);
+    state_value.set(&(), &mut state)?;
+    assert_eq!(
+        state_value.get(&mut state)?,
+        Some(()),
+        "StateValue<()> should return Some(()) after set in the same session",
+    );
+    write_kernel_marker(&mut state);
+    commit_to_storage(state, storage, &mut kernel, &mut storage_manager, prev_root);
+
+    let (storage, _) = storage_manager.create_storage_with_root();
+    let mut state: StateCheckpoint<S> = StateCheckpoint::new(storage, &kernel, None);
+    assert_eq!(
+        state_value.get(&mut state)?,
+        Some(()),
+        "StateValue<()> should still return Some(()) after commit + fresh session",
+    );
+
+    Ok(())
+}
diff --git a/crates/utils/sov-test-utils/tests/integration/empty_value_set.rs b/crates/utils/sov-test-utils/tests/integration/empty_value_set.rs
new file mode 100644
index 0000000000..3039151fef
--- /dev/null
+++ b/crates/utils/sov-test-utils/tests/integration/empty_value_set.rs
@@ -0,0 +1,182 @@
+//! End-to-end reproduction of "zero-byte values missing after query_visible_state".
+//!
+//! The SDK-layer tests in `sov-modules-api/tests/integration/state_tests/namespaces.rs`
+//! write via a bare `StateCheckpoint` and read back via another bare `StateCheckpoint`.
+//! That proves the raw `StateMap` + storage round-trip works for `V = ()`, but skips
+//! every layer that sits between a real rollup's `Module::genesis` and an RPC-style
+//! `ApiStateAccessor` read. This file fills that gap.
+//!
+//! Each test builds a minimal runtime that includes `EmptyValueSetModule` alongside the
+//! usual test runtime modules, writes a fixed set of keys in the module's `genesis`,
+//! and then queries the same module via `TestRunner::query_visible_state` — the path
+//! that was observed to return `None` in production.
+
+use schemars::JsonSchema;
+use sov_modules_api::macros::{serialize, UniversalWallet};
+use sov_modules_api::prelude::UnwrapInfallible;
+use sov_modules_api::{
+    Context, DaSpec, GenesisState, Module, ModuleId, ModuleInfo, Spec, StateMap, TxState,
+};
+use sov_paymaster::{Paymaster, PaymasterConfig, SafeVec};
+use sov_test_utils::generate_optimistic_runtime;
+use sov_test_utils::runtime::genesis::optimistic::HighLevelOptimisticGenesisConfig;
+use sov_test_utils::runtime::TestRunner;
+use sov_test_utils::TestSpec;
+use sov_value_setter::{ValueSetter, ValueSetterConfig};
+
+/// A test module that holds a `StateMap<u32, ()>` and a `StateMap<u32, bool>`. Both
+/// are populated at genesis from the module's config. The `bool` map is a control —
+/// if the `()` map loses entries across commit but the `bool` map keeps them, the
+/// difference is specifically about zero-byte values.
+#[derive(Clone, ModuleInfo)]
+pub struct EmptyValueSetModule<S: Spec> {
+    #[id]
+    pub id: ModuleId,
+
+    /// Map with the zero-byte value — the subject of the investigation.
+    #[state]
+    pub unit_keys: StateMap<u32, ()>,
+
+    /// Control map whose value type serializes to a single non-zero byte.
+    #[state]
+    pub bool_keys: StateMap<u32, bool>,
+
+    #[phantom]
+    _phantom: std::marker::PhantomData<S>,
+}
+
+#[derive(
+    Clone, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize, JsonSchema,
+)]
+#[serde(deny_unknown_fields)]
+pub struct EmptyValueSetConfig {
+    /// Keys to insert into `unit_keys` at genesis.
+    pub unit_keys: Vec<u32>,
+    /// Keys to insert into `bool_keys` at genesis (each is set to `false`).
+    pub bool_keys: Vec<u32>,
+}
+
+#[derive(Debug, PartialEq, Clone, JsonSchema)]
+#[serialize(Borsh, Serde)]
+pub enum EmptyValueSetEvent {
+    /// Placeholder — the test module never emits events.
+    Noop,
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, JsonSchema, UniversalWallet)]
+#[serialize(Borsh, Serde)]
+pub enum EmptyValueSetCall {
+    /// Placeholder — the test module accepts no call messages.
+    Noop,
+}
+
+impl<S: Spec> Module for EmptyValueSetModule<S> {
+    type Spec = S;
+    type Config = EmptyValueSetConfig;
+    type CallMessage = EmptyValueSetCall;
+    type Event = EmptyValueSetEvent;
+    type Error = anyhow::Error;
+
+    fn genesis(
+        &mut self,
+        _genesis_rollup_header: &<<S as Spec>::Da as DaSpec>::BlockHeader,
+        config: &Self::Config,
+        state: &mut impl GenesisState<S>,
+    ) -> anyhow::Result<()> {
+        for key in &config.unit_keys {
+            self.unit_keys.set(key, &(), state)?;
+        }
+        for key in &config.bool_keys {
+            self.bool_keys.set(key, &false, state)?;
+        }
+        Ok(())
+    }
+
+    fn call(
+        &mut self,
+        _msg: Self::CallMessage,
+        _context: &Context<Self::Spec>,
+        _state: &mut impl TxState<S>,
+    ) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+generate_optimistic_runtime!(EmptyValueSetRuntime <=
+    value_setter: ValueSetter<S>,
+    paymaster: Paymaster<S>,
+    empty_value_set: EmptyValueSetModule<S>
+);
+
+type S = TestSpec;
+type RT = EmptyValueSetRuntime<S>;
+
+fn setup(unit_keys: Vec<u32>, bool_keys: Vec<u32>) -> TestRunner<RT, S> {
+    let genesis_config =
+        HighLevelOptimisticGenesisConfig::generate().add_accounts_with_default_balance(1);
+
+    let admin = genesis_config
+        .additional_accounts()
+        .first()
+        .unwrap()
+        .clone();
+
+    let value_setter_config = ValueSetterConfig {
+        admin: admin.address(),
+    };
+    let paymaster_config = PaymasterConfig {
+        payers: SafeVec::new(),
+    };
+    let empty_value_set_config = EmptyValueSetConfig {
+        unit_keys,
+        bool_keys,
+    };
+
+    let genesis = GenesisConfig::from_minimal_config(
+        genesis_config.into(),
+        value_setter_config,
+        paymaster_config,
+        empty_value_set_config,
+    );
+
+    TestRunner::new_with_genesis(genesis.into_genesis_params(), RT::default())
+}
+
+#[test]
+fn test_unit_value_survives_genesis_commit_and_is_visible_via_api_accessor() {
+    let unit_keys = vec![0x12345678u32, 42, 100];
+    let runner = setup(unit_keys.clone(), vec![]);
+
+    runner.query_visible_state(|state| {
+        let module = EmptyValueSetModule::<S>::default();
+        for key in &unit_keys {
+            assert_eq!(
+                module.unit_keys.get(key, state).unwrap_infallible(),
+                Some(()),
+                "genesis-written unit key {key} should be visible via query_visible_state",
+            );
+        }
+        assert_eq!(
+            module.unit_keys.get(&999u32, state).unwrap_infallible(),
+            None,
+            "an unwritten key should be absent — sanity check",
+        );
+    });
+}
+
+#[test]
+fn test_bool_control_value_survives_genesis_commit_and_is_visible_via_api_accessor() {
+    let bool_keys = vec![0x12345678u32, 42, 100];
+    let runner = setup(vec![], bool_keys.clone());
+
+    runner.query_visible_state(|state| {
+        let module = EmptyValueSetModule::<S>::default();
+        for key in &bool_keys {
+            assert_eq!(
+                module.bool_keys.get(key, state).unwrap_infallible(),
+                Some(false),
+                "control: bool-valued key {key} should be visible via query_visible_state",
+            );
+        }
+    });
+}
diff --git a/crates/utils/sov-test-utils/tests/integration/main.rs b/crates/utils/sov-test-utils/tests/integration/main.rs
index dc741cf899..33d69a9c9a 100644
--- a/crates/utils/sov-test-utils/tests/integration/main.rs
+++ b/crates/utils/sov-test-utils/tests/integration/main.rs
@@ -1,4 +1,5 @@
 mod archival_queries;
+mod empty_value_set;
 mod execution;
 mod helpers;
 mod queries;