Current known issues list.
(Not all the bugs are listed mind you, just the ones they feel like listing.)
So in the past week, devs decide to fix instead. The ability to complete certain campaign tasks in training battles. Mainly the ones where you have to find certain troops. Like Psion this week. Which requires at least 15 World Event battles to find this week. Or (if you’re super lucky) 5 explore battles. Others will say you can find them in casual PvP by just hitting refresh until you get lucky. But if I wanted to play a slot machine game then I wouldn’t be playing Gems of War.
Best part is, “the fix” actually occurred over the weekend and actually broke training battles.
I understand that training battles were never intented as a way to complete campaign tasks. But as I’m on week 5-6 of waiting to hear from support about my tickets. And I look at this list of known issues. Some of them have been on it for over a year. Clearly you have better things to do than to fix “issues” that were never reported on the forums in the form bug reports. Never were reported as a known issue on the devs official just. And the devs probably only found out about it because at least a few players thirst for their attention over the benefit to the community at large. And that’s unfortunate.