Bug report

If you call DateTimeImmutable::createFromInterface on a class CustomDateTimeImmutable extends DateTimeImmutable, Phpstan thinks it will return DateTimeImmutable, but it will actually return the specific CustomDateTimeImmutable.
Interestingly enough createFromFormat is analysed correctly.

Code snippet that reproduces the problem

https://phpstan.org/r/070552d2-d2a8-406c-9846-10e6cf44d651

https://3v4l.org/oBrlZ

Expected output

No error.

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Phpstan 1.6 is really nice :)