Fixed Internally - Intentional or oversight on some Mob Type changes? | EverQuest Forums (daybreakgames.com) Fixed Internally - icy tormentors in Velks now see everything | EverQuest Forums (daybreakgames.com) These are marked as "fixed internally" and moved to Resolved | EverQuest Forums (daybreakgames.com), but they are not resolved. "an icy nightmare" in Velks still sees through Rogue SoS at its highest level.
Typical dev policy: flush the crap you don't want to deal with down the memory hole and hope nobody notices.