https://bugs.winehq.org/show_bug.cgi?id=50816
--- Comment #3 from Gabriele gab.pulcio@gmail.com --- (In reply to Zebediah Figura from comment #2)
Is this bug present in upstream (non-staging) wine?
Yes and it's still present on wine 6.5 staging and non-staging.
Apparently if I start Steam in offline mode, the game will load just fine