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Turns out PHP<8.3's proc_open does not really care if the requested working_dir does not exist, while PHP>=8.3's proc_open bails if it does not exist.
And due to a typo in the code, the dir never existed.
And due to insufficient error checking, the error was not really detected.
Took fking 4 hours to track down: divinity76#1
, and the fix is 1 byte 🤦♂️
Should probably complain to the php-src bugtracker, i am guessing the proc_open behavior change was unintentional (should at least be a E_DEPRECATED period "picking a non-existing working dir is deprecated and will stop working in a future version of PHP")