@phpstan-assert isn't working with Union - part 2 #14108
Description
Bug report
in phpstan/phpstan-src#4900 we added support for @phpstan-assert on unions.
I think the implementation is wrong, as the snippet suggests
Code snippet that reproduces the problem
https://phpstan.org/r/9a1e59a3-dba3-41b4-b097-ab84f6f98e4f
Expected output
no errors
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