regression: 2.2.3 starts to error about generic union parameter-type #14893

Bug report

since 2.2.3 the snippet started to error with

Parameter #2 $value of method HelloWorld::offsetSet() expects Closure(static): T, (Closure(static): T)|(Closure&T of object) given.

in 2.2.2 this snippet did not contain errors

similar problems seem to be fixed with phpstan/phpstan-src@a1b7b38

Code snippet that reproduces the problem

https://phpstan.org/r/ac2591de-f515-451b-823c-b302623d5238

Expected output

no errors

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