I've been informed that this bug is fixed and the fix will be sent to the game with future patches. Thanks for reporting and sorry for any inconvenience!
So i was fighting guy and we teleported to arena where another duel was ending after our warmup time ended for 10-15 seconds we couldnt damage each other.
Then after that duel was over we were teleported to different arena where again we couldnt damage each other for some time even if warmup...
so i joined game which was already going and we were losing 0-2 we won a round and last guy from other team left and in the end we lost whole game - why?
https://gyazo.com/ecd13efb65a19993133ca34c70cc882c