This is true for Switch as well, the game restarts one way or the other.
On the bright side, we get to hear more of that alternate World Map music (note that it does not loop).
The bigger problem is that the game doesn’t acknowledge the offer as being shown, and thus the Upgrade Offer for Dragonknight Amira keeps popping up again and again in a loop.
So far, the CLIFFY error appears unique to Dragonknight Amira? It does not likewise appear should you collect a new (any other) legendary Troop?
… Yeah, I know, that is not an easy ask.