On the map "Frozen Waterfalls": Activated the sign at the map Boss...

On the map "Frozen Waterfalls": Activated the sign at the map Boss (without entering or approaching the arena) and ran further to clean the map... Got into the crowd and died. I resurrect, and the map was completely reset (all mobs and activities were erased), only the Boss remained... An obvious bug with the cutoff at the boss. (And the arena is a separately loading territory on this map...)
PS:Boss - Riona, Winter's Cackle. the boss was easily killed on the first try...