As far as I am aware, no "quirks" have been identified to cause the kind of behavior that is being discussed in this thread. In fact, that's exactly why such a thread exists!You misunderstood what I said. I wasn't talking about dummies there because the thread established RPPM trinkets on them don't reflect a boss pull. Unless you are certain no quirks exist in the game.
Of course I cannot be certain that no "quirks" exist in the game. Blizzard can't be sure either, and that's why they call them "bugs". However, it doesn't make a lot of sense to hypothesize about "quirks" we've never heard of, when we don't really have a reason to believe they exist.
There are a lot of simple reasons that could potentially explain why the trinket didn't proc according to the log, even though we haven't heard it happen to anyone else yet. It could have procced on the same server tick the mob died. The mob it procced on could have been out of combat log range. The proc event could have been lost due to packet loss. Or as I mentioned, maybe it has something to do with immunity effects such as glyphed Ice Block. All of these are legitimate but unlikely solutions that make more sense than to hypothesize about some unknown "quirks".