Struggling to restore old backup from one cluster in another

[xeruf]

I backed up a kubernetes cluster two months ago to an S3 bucket in MinIO.
Now finally I have my new cluster set up, and after a few days of fiddling backups to the exact same bucket are working flawlessly.
But I cannot find a way to restore the old backup.
velero backup get only shows the new backups.

I found that backups have a default expiration of one month, so I edited .status.expiration and .status.ttl in the velero-backup.json, but the backup is still not showing up in the cluster after waiting plenty of hours.
I found that the old backup is generation 3 and the newer ones are generation 21, may that be an issue?
I am really starting to become pressed for time on making this work, so I would appreciate help!

Here are the old and a new backup manifest, espectively:
velero-backup.json
velero-backup-new.json

Somewhat related to #7206