Where my projects gone?

OneDrive takes control of all the file headers, and routinely scans them and adds additional metadata to the file header so it can track when to sync. That data confuses NLEs like Premiere, which check the data to ensure they are working with the correct file.

Plus OneDrive quite often can refuse Premiere rights to modify a file ... so that means the stuff you do to it isn’t actually saved to the file correctly.

So do NOT use working folders that OneDrive even knows they exist. You may get by for awhile, but at some point you may have big troubles. I speak from nasty personal experience with that horrible application.

OneDrive is grand for backup but not for editing.

OneDrive has known issues with Premiere.