File associations are lost

Always Open With is checked to use certain apps for mp4, MOV and jpg files. The choose a default app for each type of file list confirms the choices.

Yet, days later the association is gone, and the what app do you want to open this file? query returns.

This is a relatively recent phenomenon. How can Windows 11, 21H2 be convinced to retain its file associations?

Sorry no one has answered you. I just saw your post. There have been several reports about file associations lately. Try setting all apps to default from settings-apps-default apps-scroll all the way to bottom- reset. Restart.
Then set up your default apps again.
For certain file types you may have to change the default app by file type. Settings-apps-default apps-scroll to bottom 'choose defaults by file type." OR
when you go to open a file with no association it will ask you what app you want to use. Choose the one you want from the popup and select always use this app. You may have to click on more apps to find the one you want if it doesn't automatically appear in the popup list.

You have not filled out your computer specs in you profile. Could you please tell me if you are running an insider build of windows 11 or the release build.

Release build 21H2 on Windows 11Pro. The issue hasn't occurred in several weeks. Thanks for the response.