Aura Spells and random dissapearances

[Eters]

Description
==========

Characters and Creatures that have an active aura spell around them (Ancient Water Elemental's Regeneration for example) become suddenly completely invisible to the players when line of sight is broken (sometimes, It's random.)

Steps to reproduce
----------------------------
I've tried to search for a pattern to reproduce the bug consistently but it seems to occur when LoS is sometimes broken with a creature with an active aura spell on it, I've seen it about 7 times happen to my water elemental which becomes completely invisible to both me and other players. And in the fighting log it is referred to as "Someone".

"Someone is attacking X" for example.

Expected result
-----------------------
Creature remains visible

Actual result
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Creature randomly vanishes

Misc Notes
----------------
While discussing it with other players I was told that this issue has been witnessed with other AoE effects being active (battletide for instance) but I have not personally been witness to it.

Which Server(s)?
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Witnessed in Surface, Distant shores and the Underdark

Gaming Platform(s)?
------------------------------

PC

[ltlukoziuz]

So that's what it was? I had this happen twice yesterday - travelled with healer cleric, in two different spots he simply up and vanished and I could no longer talk to him in-game, although I could still send tells or barter if I did that through right-click'ing his portrait (and let me tell you, trying to talk out details with invisible person who you can't hear ICly is, well, not easy to be kosher) . Me reloading the game didn't help the bug either - it only stopped being an issue after roughly 10 minutes of waiting each time.