Bug report

I saw issue #2885, and updated to the latest version 0.12.80. But the issue remained.

Code snippet that reproduces the problem

https://phpstan.org/r/c64505e0-5173-424a-a5da-1f8ca503997a

Expected output

The output is Method ClassImplementation::convert() should return static(ClassImplementation) but returns ClassImplementation.. Afaik the implementation should be completely acceptable. It looks a lot like issue #2885, maybe it has something to do with the method being?