This will leave array gaps for blocks not to be validated, and for blocks pending validation. If there is a stop with the pending validation gaps, a restart at a restore point will cause the gapped blocks to be validated with prevouts filled in to the table and its index. But the snapshot cannot be relied upon in the range where writes have occurred since the last snapshot (guaranteed flush). This is essentially the same problem as with the height indexes. These can be managed in the backup and restore process due to the simplicity of the tables.