implication of having a vmdk disk following snapshot file naming convention?

Hi,

platform: ESXi 6

VM: RHEL 6

I am posting this to see if anyone encounters the similar issue or has suggestions...

We have a VM that has no snapshots listed in the snapshot manager. in the datastore, there is a vm-000001.vmdk in addition to vm.vmdk file. To me vm-000001.vmdk looks like a snapshot file. In the VM's settings, there are two disks listed: vm-000001.vmdk and vm.vmdk. Inside the VM, /dev/sda and /dev/sdb are used for different purposes. Backup attempts always fail because it complains the disk is already open. CommVault support suggests rename vm-000001.vmdk to a different name because CommVault thinks there is already a snapshot for the VM hence it fails. Before going through vmdk rename process, is there anyone encounter this kind of issue?

Thanks,