Same issue as described here: Mana bar flashing when not full
But that thread is closed so I can’t add to it.
Raiding this morning and noticed that Lianna’s mana bar was flashing even though it wasn’t full. Gain still happened as normal. Happened for four raids in a row (yes, three against the same opponent… don’t judge). It seems to only be the first time her mana bar is “activated”. After I fire the special skill once, it behaves as normal (no flashing).
I noticed it yesterday while playing Avalon but did not document with screen shots.