Welcome to the Airtable community!
I recommend contacting support directly with this issue.
I have occasionally gotten similar messages when trying to perform bulk actions in the user interface. Sometimes waiting for a while, then retrying the operation works. Sometimes it does not.
I hope that you are able to recover the records. However if you need to get the data from a snapshot, you could export the data from the snapshot, and then import it into the original base. This may reduce some of the headaches involved in restoring from a snapshot.
In the meantime, you have my sympathy for having to deal with this.