Platform, device version and operating system
Android, Pixel 6a, Android 13
Screenshot or image
What you were expecting to happen, and what actually happened
When an enemy dies by burning, it does not advance to next enemy or finish the battle, it hangs indefinitely. Force close and restart will advance the battle correctly after that. The above video was for very high burn, but also applies at low burn.
How often does this happen? When did it begin happening?
Appears to always happen if enemy dies via burning. Granted that is likely a very rare case.
Steps to make it happen again
Apply burning to low hp enemy, end turn until enemy dies. Having higher numbers of imp gems on board makes it quicker.