If the bug is specific to my device then I’ll provide more details upon request.
Twice today I’ve been notified about the 24 pet rescue at the end of a battle.
It’s never happened prior to patch 5.3
First time was at the end of an adventure battle. I ended that play session.
Came back and played a Tower of Doom battle and got the pet rescue splash screen at the end of the battle again.
Had it happen again after the 5-8 Arena victory today. This time on my Chromebook, not on my Android phone.
Happened again during a new arena run. Maybe tied to using new teams? Still on the Chromebook under the same play session.