I dont know why this is happening
Unfortunately UEFN has problems with OneDrive.
Have you Done Check-in-Changes with your project ?
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I cant even get in it to sync latest
This may not help, I haven’t had experience with an unfound Plugin, but maybe worth a try…
With Windows file explorer, move your entire Fortnite Projects folder from your Documents to a new spot where Onedrive and UEFN can’t see it like C:\Backups
Make a new empty Projects Folder without OneDrive backup, Like C:\Fortnite Projects
Go into UEFN, ignore everything, open a new blank map
In new blank map go to Edit Menu, select Editor Preferences, go down to Project Folders, add an Array element and click on … point it to your new empty Fortnite Projects folder.
Now goto File New/Open Project and Download your Project, cross fingers.
If the project download is not there or is too old you can delete it from your new Projects folder and copy the backup from your Moved ones to the new folder…
I hope it works