What you were expecting to happen, and what actually happened: I triggered a pet rescue in PvP (after waiting for the ongoing pet rescue to finish). The pet rescue screen popped up which took me to the pet rescue event. Once I completed this, I returned to PvP to continue my battles in the same region. That is when the cliffy appeared.
How often does this happen? When did it begin happening? Every time I rescue the pet which I triggered in PvP and return to the same PvP region to continue my battles.
Steps to make it happen again
Finish the pet rescue battle in PvP (after waiting for the ongoing pet rescue to finish), select which pet you want to rescue.
Wait for pet rescue screen to pop up and rescue the pet by completing all the battles.
Return to PvP (same region) and continue your PvP battles.
Add my name to the list of victims. I lost two pet chances (after using Gnome Bait both times) that immediately went to a Cliffy error after winning the battle! Never even got a chance to pick a pet. I have now lost something (twice) that I have spent real world money on and will probably never be able to recuperate : ( (Xbox Series X)
Same here, found a pet gnome, clicked on rescue and went to the pet rescue, after rescuing the pet was back in PvP and continued on where I left. Cliffy error right away.
I chose the cosmetic pet on the right side (not sure that is relevant.)
