I also have this issue. The same thing happened before in Preview 1.21.120.21, which has been reported as MCPE-227838
Just found out that this is a duplicate of WEB-8301, but I couldn’t find it because the bug list didn’t load
Reinstalling with the .22 update did work! Thanks a lot!
Still happens in 1.21.120.22
I didn’t get any error messages, and restarting the PC did not help, I couldn’t get it loading a single time
This was the screen which opened after the Mojang Studios window closed, which lasted for less than a quarter than a second before it simply closed the app (don’t mind the green color):
On my second laptop, this white screen also showed for a second but the regular Minecraft loading screen opened immediately after.
Another weird thing I noticed was the app icon on the taskbar. Instead of a black background, it showed a red background which it didn’t show before. On my second laptop, both the MC and Preview icons don’t have a background at all.
I didn’t get any other unexpected behavior, and everything else seemed to be working just fine, no pending updates, no account issues, device specifications all perfect, enough empty disk space and memory.
Update: I just found out that I do have the new GDK version, the old filepath was still there but some files were moved to the new location. It also seems to be a device specific issue as my other PC can launch this Preview just fine.
Yes, it does for me