Yashraaj 1st ability still ignores freeze on hit minions like water elemental and balindas elemental.
Twilight extinction still goes off if bownsamdi uses his board refresh ability and the opponent doesn’t put sinestra on board.
Yesera has several bugs with her abilities that speed up all characters by 4 speed, the first ability heals non dragons,
Elise and tyrande. Tyrande can skip quest a nature ability.
Sure there are several more but since very few play mercs it’s a non issue
Yeah, we know.
See above and the topic I linked there…
Really? That’s new to me, maybe I should test it.
UPD: Tested it specifically with Cariel to taunt and preferably take damage, Aranna, who would jump to the bench, so that Ysera’s Verdant breath wouldn’t have any other targets, and Ysera — and I can’t confirm the issue with this setup, neither have I noticed it in PvP. Could you specify under which circumstances you observed a problem and how one could reproduce the situation to test it?
Could you elaborate what what you mean in particular? Elune’s Grace with Band of the Wilds can make her third ability cast twice, but since the latter transforms after each cast, this should, roughly speaking, advance the quest by two steps. The same applies to the second ability.
‘Several’ is an understatement.
I believe you would do well to speak for yourself and not overgeneralise, my friend. 
Yashraaj another bug if he attacks a target that has divine shield from elementary given by Holmes. The target will attack the character is in front and if dead yashraaj continues to attack as if nothing happened. And even though his attack didn’t kill the target yashraaj will count it.
Thinking this is a coding limitation. Probably a very specific bug.
Yes, this looks like a very specific interaction. However, it reminds me of how Geddon’s living bomb, for instance, would count for fulfilling some tasks’ criteria, such as to destroy things with other skills, if they also triggered the bomb — maybe something similar is going on.
Have you got anything to say about what I asked earlier, can you clarify those points?
Ysera 1st attack doesn’t always heal the damaged dragon so either correct tooltip or something.
Ysera speed up ability. Speeds up all units on your board including minions hence a bug or needs a tooltip change.
Here’s a fun one. Deathwing a legendary Merc with soul equipment. Will steal the summoned dragons but they maintain their attack target rendering the equipment comical. Tool tip needs change or bug.
If you queue an ability with cool down and all characters are dead expect stealth Valera. The cool down is lost and ability won’t auto target Valera even if the reveal animation plays.
The elune grace says cast nature ability twice. But not Elise abilities are nature in the quest. Hence a non nature ability is casted. Hence a bug. Similar interaction with brann 3rd ability on Elise.
Ah, that… Mercenaries: Ysera's Verdant Breath is a problem . From your description it sounded as if Verdant Breath healed non-dragons.
Listed above already.
This is also known: (Mercenaries) Fun strategies for bounties - #5 by SparkyElf-2852
Interesting, I haven’t noticed it and cannot confirm yet.
Ah, I see what you mean. Well, according to what I’ve written above, there is some logic to it, so I’m not sure whether this is a bug, although it’s a confusing situation.
What’s wrong with that? It is supposed to just re-cast the ability twice. Of course, it transforms.