destroy failed

We have been using Proxmox for years and have a 3 nodes cluster that had been healthy for a while then recently we noticed that VMs couldn't be deleted (destroyed) by any means (GUI, CLI, or the API) We don't see any storage issues that could refer to a problem with file locking, The VM disk...

This is the same error that I posted here. However, the resolutions in that thread are not working. I've narrowed down the problem as a multipath issue, but I'm creating a new thread because this situation seems to be unique. Node A and B were clustered and are running v6.4-13 and are identical...