Missing files on a datastore

I've recently had an issue where in a specific folder, where the descriptor files for a bunch of disks have mysteriously disappeared. The flat files are still present and don't appear to have anything wrong with them and I can re-create the descriptors but I am at a loss to explain why or how this could have happened. We use this platform as a destination for Zerto replication and the folder affected is called "ZeRTO volumes". I have opened tickets with both Zerto and VMware to investigate but so far we have no root cause - I was hoping someone on here might have some insight?