< Cross posting from the Bug Forum for player’s information >
There was a hot fix, which removed the .05 sec internal cooldown of Wither. This appears to have broken the ability so only the First application of Wither remains on the target. Subsequent casts by other players are immediately removed, {like one would expect from multiple applications of Curse of Tongues, for example}.
- again, cross posting for Information. There is a thread in the bug forum.