Hi there,
I'm sorry, but this may be related to the discontinuation of Creative Cloud Sync for Premiere Rush.
Rush projects that depended on cloud-synced project data needed to be migrated or backed up before the sync service was discontinued. Unfortunately, having the original source media still available does not restore the edits if the Rush project data was stored in the cloud and was not migrated.
If you don't have another device with a working local copy of the project or a separate backup, unfortunately there isn't a way to recover the missing cloud project data.
More information:
https://helpx.adobe.com/premiere-rush/desktop/kb/creative-cloud-files-end-of-life-for-premiere-rush.html
I'm very sorry I don't have better news.
Thanks,
Kevin