Killed by some explosion after completing floor

I was literally reading the sign Flor Completed, when some delayed ground effect took me out with a 4K blast through both my energy shield and hit points. Why is this even in the game!? Floor Completed should mean floor completed.

No wonder people hate these trials. And here's the issue that supersedes the bug. Such game design turns people off from wanting to play.

Every time I get a bug in this slot machine grinder, I now have to wait 15 mins for the zone to reset itself. How is this even vaguely acceptable!? Well, the answer goes as follows: it isn't.