I’ve already submitted a ticket for this, but it hasn’t been patched yet, so I’m posting here so more people know about it.
Seemingly randomly, channeled spells like flay and torrent skip their last tick and/or don’t refresh things they are supposed to. This means fully channeled mind flays will sometimes not refresh Mind Trauma, and Void Torrent will sometimes not hit its last tick and leave Entropic Rift’s duration 1 second shorter than what it should be. This means that sometimes you will lose out on 20% extra rift damage b/c your Devouring Plague came up during that one second window that was lost due to the bug. It’s also frustrating to lose Mind Trauma stacks when you get this bug twice in a row on Mind Flay.
I’ve tried testing whether the spell queue window has any effect, but I have seen this bug with various settings, so I’m not sure what’s going on.