Regression on combination of array_map and array_flip

### Bug report

The snippet was not reporting any error in 2.51.0
https://phpstan.org/r/62c5d44b-39ec-4943-84d5-3c2319cb5f89

### Code snippet that reproduces the problem

https://phpstan.org/r/62c5d44b-39ec-4943-84d5-3c2319cb5f89

### Expected output

No errors

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