Seems like issue fixed for me. No popup while loading game. Dc-6 worked as wasm active. Looks like it was related to xbox server issues, and server issues fixed as it says here Xbox Support . Server issue symptoms was 100% packet loss on “Network Settings” > “test multiplayer connection” and “test network speed & statistics”. I am getting 0% packet loss now at those tests and “Microsoft Flight Simulator: Add-on Support” store page is not poping up while game is starting.
If you are still experiencing same issue please check your packet loss % at those xbox network tests at options and wait Microsoft fully fix all regions i am guessing.
Tbh this should not be happening when this kind of xbox server issues happen, wasm is Online only?
Edit: Tested 2 more times, no popups at loading. But at 2nd test it gave network disconnected warning for a second and green connected sign popup ingame main menu. I will report back if something happens again.