"Synthetic Full" missing from Replica's when doing failover

[sixpack]

One of our replication jobs have started to fail due to a VSS error.
The VSS error we expect to be able to resolve soon, however when we go to Failover the server in Veeam, there isn't a Synthetic Full option listed.

The only option listed is a series of Roll-backs.

Is it safe to failover to one of the roll-backs if "Synthetic Full" is not listed in the replicas?
Synthetic Full is listed in the other jobs which are working.

[Gostev]

Yes, it is safe. Even if you cannot failover to the latest state because the latest replication was not successful, you can always failover to the previous state.