if the debug mode is not enabled, BO is showing following error message:
Attempted to load class "AdminLegacyLayoutControllerCore" from the global namespace. Did you forget a "use" statement?
If I enable debug, BO is accessible again, but new orders are showing no status (screenshot attached).
Here are the steps that led to that error:
1. Yesterday no issues at all, today all combinations for all products were missing. And I haven't touched a single file, setting, etc ...
2. I cleared cache and tried to change PHP version to see if the issue persist
3. After changing PHP version I started to receive the "Attempted to load class...." error. I switched back to previous PHP version but the error message persists.