diff --git a/src/Paket.Core/PaketConfigFiles/ProjectFile.fs b/src/Paket.Core/PaketConfigFiles/ProjectFile.fs
index c7fac7430c..b5d47435c5 100644
--- a/src/Paket.Core/PaketConfigFiles/ProjectFile.fs
+++ b/src/Paket.Core/PaketConfigFiles/ProjectFile.fs
@@ -2087,12 +2087,24 @@ type ProjectFile with
     member self.GetTemplateMetadata () =
         let prop name = self.GetProperty name
 
+        // SDK-style projects (new csproj format) expose several pack-related
+        // properties under a "Package" prefix (e.g. PackageReleaseNotes,
+        // PackageProjectUrl). Fall back to the "Package"-prefixed name when the
+        // plain property isn't present, so both old- and new-style projects work.
+        let propOrPackage name =
+            match prop name with
+            | Some _ as v -> v
+            | None -> prop ("Package" + name)
+
         let propOr name value =
             defaultArg (self.GetProperty name) value
 
         let propMap name value fn =
             defaultArg (self.GetProperty name|>Option.map fn) value
 
+        let propMapOrPackage name value fn =
+            defaultArg (propOrPackage name|>Option.map fn) value
+
         let tryBool (s: string) = Boolean.TryParse s |> function true, value -> value | _ -> false
 
         let splitString = String.split[|';'|] >> Array.map (fun x -> x.Trim()) >> List.ofArray
@@ -2107,22 +2119,22 @@ type ProjectFile with
         let optionalInfo =  {
             Title = prop "Title"
             Owners = propMap "Owners" [] splitString
-            ReleaseNotes = prop "ReleaseNotes"
+            ReleaseNotes = propOrPackage "ReleaseNotes"
             Summary = prop "Summary"
             Readme = prop "Readme"
             Language = prop "Langauge"
-            ProjectUrl = prop "ProjectUrl"
-            IconUrl = prop "IconUrl"
+            ProjectUrl = propOrPackage "ProjectUrl"
+            IconUrl = propOrPackage "IconUrl"
             Icon = prop "Icon"
-            LicenseExpression = prop "LicenseExpression"
-            LicenseUrl = prop "LicenseUrl"
+            LicenseExpression = propOrPackage "LicenseExpression"
+            LicenseUrl = propOrPackage "LicenseUrl"
             Copyright = prop "Copyright"
             RepositoryType = prop "RepositoryType"
             RepositoryUrl = prop "RepositoryUrl"
             RepositoryBranch = prop "RepositoryBranch"
             RepositoryCommit = prop "RepositoryCommit"
-            RequireLicenseAcceptance = propMap "RequireLicenseAcceptance" false tryBool
-            Tags = propMap "Tags" [] splitString
+            RequireLicenseAcceptance = propMapOrPackage "RequireLicenseAcceptance" false tryBool
+            Tags = propMapOrPackage "Tags" [] splitString
             DevelopmentDependency = propMap "DevelopmentDependency" false tryBool
             DependencyGroups = []
             ExcludedDependencies = Set.empty //propOr "ExcludedDependencies"
diff --git a/tests/Paket.Tests/Packaging/PackageProcessSpecs.fs b/tests/Paket.Tests/Packaging/PackageProcessSpecs.fs
index 7f07b009ca..97ae90297d 100644
--- a/tests/Paket.Tests/Packaging/PackageProcessSpecs.fs
+++ b/tests/Paket.Tests/Packaging/PackageProcessSpecs.fs
@@ -94,4 +94,33 @@ let ``#3195 resolveProjectId does not override an id already present in the temp
 """
     let projFile = ProjectFile.LoadFromString("dummy.fsproj", projectFileContents)
     Paket.PackageProcess.resolveProjectId projFile "AssemblyName" (Some "Template.Id")
-    |> shouldEqual (Some "Template.Id")
\ No newline at end of file
+    |> shouldEqual (Some "Template.Id")
+
+[<Test>]
+let ``#3603 GetTemplateMetadata reads PackageReleaseNotes from an SDK-style csproj``() =
+    let projectFileContents = """
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <PackageReleaseNotes>Fixed some bugs.</PackageReleaseNotes>
+  </PropertyGroup>
+</Project>
+"""
+    let projFile = ProjectFile.LoadFromString("dummy.fsproj", projectFileContents)
+    let _, optionalInfo = projFile.GetTemplateMetadata()
+    optionalInfo.ReleaseNotes |> shouldEqual (Some "Fixed some bugs.")
+
+[<Test>]
+let ``#3603 GetTemplateMetadata prefers plain ReleaseNotes over PackageReleaseNotes``() =
+    let projectFileContents = """
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <ReleaseNotes>Plain wins.</ReleaseNotes>
+    <PackageReleaseNotes>Package loses.</PackageReleaseNotes>
+  </PropertyGroup>
+</Project>
+"""
+    let projFile = ProjectFile.LoadFromString("dummy.fsproj", projectFileContents)
+    let _, optionalInfo = projFile.GetTemplateMetadata()
+    optionalInfo.ReleaseNotes |> shouldEqual (Some "Plain wins.")
\ No newline at end of file