Bug report

Hello!

Please see larastan/larastan#2327 for context.

The user added a mixin to the child of a class that had been marked as a universal object crate. The only way for the user to move forward was to override the configuration. However, it would be great if mixins were checked before falling back to mixed.

Code snippet that reproduces the problem

https://phpstan.org/r/e05c908b-49b0-4c80-aab9-479d9dd69c6e

Expected output

I would expect there to be no errors

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