Encrypted backup of only one VM fails, but non-encrypted works fine

Again, the full path to the problematic chunk is:
Bash:
/mnt/dtsynlun2/.chunks/552b/552bef595b29e12e35478064ddf764383b8f593dadc606df538dbed7bd0407df
I do very much appriciate your help, and I am sorry if I am not doing each step correctly, I am fairly new to proxmox backup and certainly new to troubleshooting its issues.

When I run the command with that path I get the following:

root@yscdtpbs:~# proxmox-backup-debug inspect chunk /mnt/dtsynlun2/.chunks/552b/552bef595b29e12e35478064ddf764383b8f593dadc606df538dbed7bd0407df
Error: could not open chunk file - No such file or directory (os error 2)


If I attempt to list the chucks in the file system that chunk directory does not seem to be present:

root@yscdtpbs:~# ls /mnt/dtsynlun2/.chunks/552b/552be*
/mnt/dtsynlun2/.chunks/552b/552be28cfba2c564708ffced57ea7ee9d333cce5079f78bcc94d8b89855d2c12
/mnt/dtsynlun2/.chunks/552b/552be305fc23c0b950520a4b5c30fa26c4c8373f6d574d7c6ef0b6980152e75a
/mnt/dtsynlun2/.chunks/552b/552be57a7a1a134a279213985f25f0ce994f6d22c3dd79a351d11e3ffbe1a74c
root@yscdtpbs:~#
 
okay, so now if you do another backup, you still get the same error from your initial post (referencing the same chunk)?