It isn't reporting when you return a variable that could be false #8223
Description
Bug report
If the signature of the function states that the return type is, for example, DateTimeImmutable and you returns DateTimeImmutable|false, phpstan didn't report it.
Code snippet that reproduces the problem
https://phpstan.org/r/5f6db730-672e-410b-9296-8bff29660974
Expected output
It should report an invalid variable type return.
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