Offset 1|2 does not exist on array{1?: type, 2?: type} after safety-check by array_key_exists is performed #7763
Description
Bug report
Tested on 1.8.2
Code snippet that reproduces the problem
https://phpstan.org/r/f4e1ed64-c315-4618-94c7-8cda6151dca4
Expected output
No error