I'm not sure whether this counts as a bug, so I'm putting this in general. Anyways, I just did a practice raid, and I died during the practice raid. When I teleported back to the hub after, I had 3 levels. Before the practice raid, I had 15. So I was still losing levels, despite it being a practice raid. I'm not sure if this makes a difference, but I am town hall 1. Also, sometimes I would usually randomly forfeit the practice raid as I was rowing to the island on the boat. I would also lose any blocks I used during the practice raid.