Sylvanas Cursed Boss Quests

Finding it frustrating.

I’d love to get chance to try and beat these 3 bosses while they’re cursed BUT they just aren’t there!
I’ve been battling for a couple of hours solid and I’m just not getting Jaina, Tyrion or Cenarius battles.
This is just nuts. There’s 3 event challenges that rely on specific bosses - but the bosses don’t spawn! If they don’t spawn, I can’t even TRY to defeat them and meet the challenges.
It would help if you could see which boss a quest will be for just from the “choice of 3” that you get rather than having to launch the quest to find out.

Select them on the map. You can select them there.

FYI: Cenarius is unkillable atm due to insane self healing
FYI2: Killing Jaina while cursed doesn’t register
FYI3: Tirion IS killable and registers succesfully

Tried Tirion on heroic but he kept kicking my butt. Persisted with the standard quests and eventually had Tirion and then Jaina spawn. Beat both whilst cursed and both were registered on the event challenges. So it looks like any bug on Jaina is fixed now and it does register if you get her cursed and then kill her.

To get credit for the kill for the Sylvanas event, the boss needs to be killed by another unit / spell. Only having the curse on the boss and killing it wont suffice.

Cenarius IS killable. In overtime spammed his behind with everything I got and got him down eventually.