BUG: Test failure on 9.1 branch with lowest doctrine dependency

[mficzel]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

The tests with lowest deps fail with

The return type of method "setTime" in class "Neos\Flow\Tests\Functional\Persistence\FixturesPHP8\ExtendedTypesEntity_Original" is invalid.
Type: Doctrine\Common\Proxy\Exception\UnexpectedValueException

see: https://github.com/neos/flow-development-collection/actions/runs/19628483203/job/56202395293

Expected Behavior

Green 9.1 branch

Steps To Reproduce

No response

Environment

- Flow: 9.1 deps lowest
- PHP: 8.2 (probably +)

Anything else?

No response