See https://en.wikipedia.org/wiki/Special:AbuseLog/18317981
According to Special:ListGroupRights bots should have the extendedconfirmed user right, but it does not show up as a value in the AbuseFilter variable user_rights. I do see all the other expected rights, so perhaps there was some config change we overlooked when deploying the new user group (T126607 and maybe T131976)?