Bug report

while playing with a few examples to fix and learn about #7563
I realized that sscanf can return a array containg NULL

Code snippet that reproduces the problem

https://3v4l.org/llJMs
https://phpstan.org/r/c113455f-7972-436d-829b-01ba659e8e20

Expected output

array, allowing null at the offsets