Bug report

using phpstan.neon:

parameters:
    reportPossiblyNonexistentConstantArrayOffset: true
    reportPossiblyNonexistentGeneralArrayOffset: true

    dynamicConstantNames:
        LOG_DIR: non-empty-string

we get a

Offset mixed might not exist on non-empty-array.

error on line 10 while the offset will definitly exist

Code snippet that reproduces the problem

https://phpstan.org/r/7f5885a6-03c1-4110-a2bd-dfc868470d33

Expected output

no error on line 10

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