Ok, I've verified it's a bug:
https://bugzilla.wikimedia.org/show_bug.cgi?id=40190
I think stewards are already working on it to decide what's best, but
you can ask at the page I linked; or local sysops can whitelist the IPs
if they willing to (they were locally blocked as well, so I've no idea
if they do).
Nemo
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