If a wiki hasn't seen enough traffic that Block::purgeExpired() is called, it's possible that there are expired blocks plus autoblocks, and when those autoblocks are extended, the expired block will get extended as well.
Customize query in gerrit
|Resolved||demon||T128481 Local block of 126.96.36.199 not expiring on betawikiversity|
|Resolved||demon||T124940 MediaWiki 1.26.3 security release|
|Resolved||Legoktm||T128695 Block::updateTimestamp() updates expiry of all blocks for the IP|
|Resolved||DannyS712||T257393 Local block of 188.8.131.52 not expiring on outreach.wikimedia|