Bug report

Hi @ondrejmirtes, I'm getting an error that I don't understand at all
https://phpstan.org/r/1aa2d004-995a-4677-973e-17068b828291

I don't know if it's related but I can also produce another weird error with
https://phpstan.org/r/c74a81ae-f8ab-48e1-8bc4-62a2c02e8613

"expects T of Foo, got T of Foo".