So it turned out the changes in the following commit broke wifi only on T2 Macs with BCM4364 and BCM4355 chips.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/wireless/broadcom/brcm80211/brcmfmac?h=v6.13&id=ea11a89c3ac64ada9d8b7f7de279cb6385ed194f
I’ve sent a patch with the fix here:
https://lore.kernel.org/linux-wireless/47E43F07-E11D-478C-86D4-23627154AC7C@xxxxxxxx/T/#u