Thumbnail job handler fails on certain files

My Immich logs shows several errors like: Unable to run job handler (AssetGenerateThumbnails): Error: Input file contains unsupported image format
I've read conflicting information on what this means and the best/official/safest methods to resolve it.
I'm aware of the SQL command to use while connected to the postgres console to see the affected files:
select a.id, a."originalPath" from assets a where a.id = 'image'

Could you advise what the recommended way is to handle such messages?

Troubleshooting steps: None taken so far
Changes made: None which were recent or relevant
System details: Immich is running through Dockge as part of a Debian LXC in Proxmox. The physical machine runs on a Ryzen 5 5600G and 64 GB of RAM
Storage details: The LXC itself is stored on a SSD attached to the system, whereas the images themselves are mounted via an NFS share from TrueNAS running on a ZFS array of hard drives. df -h output is attached below
Immich version: 1.136.0 running on Linux 6.8.12-13-pve
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