GUI Error: “Failed to load datasets – casesensitivity: failed to get property” after replication (TrueNAS SCALE 25.10)

TrueNAS General
1

Hi everyone,

I’m seeing a persistent GUI error on my TrueNAS SCALE 25.10 system when I open “Datasets” in the web interface.
The message says:

Failed to load datasets
casesensitivity: failed to get property

Setup description

I have two TrueNAS SCALE systems:

  • Droptank → the source system
  • Dropbox → the target system (used as replication destination)

Replication is set up for three independent dataset trees:

  • Nextcloud (Nextcloud app data)
  • Immich (photo storage)
  • Private (general data archive)

Each replication target lives under:

Speichertonne/Backup/Droptank

Here’s an excerpt from the target system (Dropbox ):

NAME                                              USED  AVAIL  REFER  MOUNTPOINT
Speichertonne/Backup/Droptank                     278G  5.06T   104K  /mnt/Speichertonne/Backup/Droptank
Speichertonne/Backup/Droptank/Immich              138G  5.06T   112K  /mnt/Speichertonne/Backup/Droptank/Immich
Speichertonne/Backup/Droptank/Immich/data         138G  5.06T   138G  /mnt/Speichertonne/Backup/Droptank/Immich/data
Speichertonne/Backup/Droptank/Nextcloud          33.9G  5.06T   104K  /mnt/Speichertonne/Backup/Droptank/Nextcloud
Speichertonne/Backup/Droptank/Nextcloud/appdata   484M  5.06T   484M  /mnt/Speichertonne/Backup/Droptank/Nextcloud/appdata
Speichertonne/Backup/Droptank/Nextcloud/data     33.4G  5.06T  33.4G  /mnt/Speichertonne/Backup/Droptank/Nextcloud/data
Speichertonne/Backup/Droptank/Nextcloud/db       78.6M  5.06T  69.9M  /mnt/Speichertonne/Backup/Droptank/Nextcloud/db
Speichertonne/Backup/Droptank/Private             107G  5.06T    96K  /mnt/Speichertonne/Backup/Droptank/Private

What I’ve checked so far

When I checked the casesensitivity property, it seems valid:

zfs get casesensitivity Speichertonne/Backup/Droptank
NAME                           PROPERTY         VALUE        SOURCE
Speichertonne/Backup/Droptank  casesensitivity  sensitive    -

So the dataset does have the property set correctly.
Everything else seems to work fine — replication continues, mounts are correct, and I can browse the data via CLI.

Current behavior

  • The error only appears in the Datasets section of the GUI.
  • All command-line operations (zfs list, zfs get, zfs mount, replication) work normally.
  • It looks like the web UI fails to read a property on received datasets.

Questions

  1. Is this a known issue in SCALE 25.10?
  2. Should I manually set or inherit the casesensitivity property on replicated datasets, or is it better to leave it untouched until a fix is released?
  3. Would it help if I exported a full zfs get all for these replicated datasets?

Additional context

I have not yet modified any of the replicated datasets or changed properties manually — they are in their original, received (readonly) state.
Replication tasks continue to run normally, and no data seems affected.

Thanks in advance for your help and insights!

3

Sorry for the spam, I couldn’t see where I edit my post.
For reference, these are my current replication tasks configured on the source system (Droptank ).
Each one pushes a dataset tree to the corresponding location under
Speichertonne/Backup/Droptank on the target (Dropbox ).

1. Thinktank/Immich → Speichertonne/Backup/Droptank/Immich
   Direction: PUSH
   Recursive: true

2. Thinktank/Nextcloud → Speichertonne/Backup/Droptank/Nextcloud
   Direction: PUSH
   Recursive: true

3. Thinktank/Private → Speichertonne/Backup/Droptank/Private
   Direction: PUSH
   Recursive: true