Bug report

See attached reduced testcase.

Note that:

• the error does not occur when list<array<?string>> is replaced with list<array<string>> on line 3;
• the error does not occur when $x[0] ?? null is accessed before $x[0]['bar'] ?? null on line 5.

Code snippet that reproduces the problem

https://phpstan.org/r/b22adb57-2821-465c-b3ad-625b98c8d6a1

Expected output

No error on line 6.

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