Dungeon challenge-have I been an idiot this whole time

I had never completed a dungeon challenge before, until this event. The Difference between this challenge and past events was I did something I had never done before, I adjusted my lineup as my mons health was low. My question isn’t about changing your lineup, I always knew you could do that with mons on your team just none in the bottom bar. What I’m curious about is as I do change my lineup and I lose a mon, the previous mon that was low on health enters the field now with a full health bar. So my question is has that always been the case or is it a glitch? And have I been an idiot for never doing it?

Sorry, that’s a glitch. No idea why it happens.

The monsters that were subbed were healing that’s why when they entered they’re in full health. :joy: