In the Project Grid / list of the Modern UX, it is noticed that when we click on the "Details" button, the flyout that opens does not contain any values. This in spite of the record that is being viewed containing data against the fields displayed in the flyout. This data is visible if we go into the Project Details tab.
If it is attempted to update any field from the flyout, then it is observed in a Browser trace, that HTTP 400 is thrown against a PUT call that is made by the application.
Corrupted folder structure.
Rebuilt the app folder structure.