Over the last week this has been recurring. It is sometimes resolved by the daily refresh.
After winning and finishing a quest, instead of the Victory screen with the “Continue” button, the Warcraft Rumble loading screen appears, and I’m back at the main map screen. The “Claim” button with the type of troop getting xp does not appear.
And when hit the quest button, it’s the same 3 quests that appear, and clicking them just repeats the process over again.
This is on an iPhone 15 running iOS 18.4.1. Not sure how to find the Rumble version but it is updated as of today May 22, 2025.