I am playing on a Samsung Galaxy S6, Android version 6.0.1. I unfortunately don’t have a screen shot or image for this issue.
I was attempting a tier 2 fight with Cedric’s secret camp in the new Delve event, level 30. The fight turned into a loading loop. I think this was because it was tryinh to do a daily reward update at the same time. Since it was stuckin a loop, I had to reset the game and when it loaded the Delve back up, I was treated as if I had run from the fight and the delve was over. Pretty upset since I had 2 rooms left and then boss to finish level 30 and lost out on rewards from fights I likely would have won.
This was a once-of bug, never had it happen to me before.
This would be a hard one to recreate since I believe it happened right when the game attempted to hand out daily rewards AND load a delve event fight at the same time.