I’ve been using Deezer on my ipad for 2 years without a problem until now:
A new ad by Deezer (AnimeVerse) launches in full screen mode on my connected screen when the main Deezer window is on my ipad. It is impossible to click on the ad, it completely blocks the screen and stops me working. When I close Deezer the Stage Manager configuration is then changed. To get it back to how it was I must mirror the screens in display settings, then un-select mirror to re-initiate Stage Manager.
It appears that the developer of this Deezer Ad did not think of the new iPad Stage Manager or that someone might use Deezer on their ipad while they are working on a connected screen. Its an extremely annoying problem, Deezer: please help!