My global account is in the stewards' global group which includes both ipblock-exempt and globalblock-exempt permissions. That should allow my account to edit on all wikis even if the IP or IP range I am using (or any other member of said global group) is locally or globally "hardblocked" (i.e. logged-in users using that IP or network are prohibited to edit).
Since today, I am however no longer able to do so; not even my user page and I'm suspecting a Regression of some sort is happening as I've been able to edit without issues until today, and the oldest block I can find on the VPN range dates from May 2020.
An API query (action=query&meta=userinfo&uiprop=rights) on enwiki lists my account as indeed having ipblock-exempt and globalblock-exempt permissions.
Filing privately for precaution, just in case private info is needed to identify the causes.