[dolphin] [Bug 450482] New: Remote folder previews no longer working after recent update to Plasma 5.24

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=450482

            Bug ID: 450482
           Summary: Remote folder previews no longer working after recent
                    update to Plasma 5.24
           Product: dolphin
           Version: 21.12.2
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: folders
          Assignee: dolphin-bugs-null at kde.org
          Reporter: AF at absolutelyfree.me
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 146883
  --> https://bugs.kde.org/attachment.cgi?id=146883&action=edit
Screenshot of folders that should have previews but do not.

SUMMARY
Prior to the recent update to Plasma 5.24, all previews (for both files and
folders) worked correctly on my systems in all scenarios. Now when I try to
view file shares from my NAS within Dolphin, the folder previews specifically
no longer load. I can still see the previews for individual files once I
navigate into folders that contain files, but there are no previews being
loaded for folders in the folder icons. I also see folder previews for local
folders correctly, it is just the remote folders that are not showing previews.
I am seeing this issue on 3 different desktop systems (all running fully
updated Arch Linux), and all of them are connecting to my NAS via NFS shares. I
have confirmed that no settings have changed on my end and that these folders
should have previews being displayed.

See attached screenshot, each of those folders contain video files but no
folder previews are being displayed. These exact folders used to display
previews correctly before the 5.24 updates.

I thought this might be an issue only on my end until I saw this forum topic
(linked below) where another user described having the exact same issue as me,
which leads me to believe this might be a KDE issue and not just me.

https://forum.kde.org/viewtopic.php?f=224&t=174173

STEPS TO REPRODUCE
1. Mount a remote file share that contains folders that have files which should
result in folder previews being displayed for those folders.
2. Confirm that your Dolphin preview settings are configured correctly so that
previews should be displayed for those folders.
3. Open the remote file share path in Dolphin.

OBSERVED RESULT
Folders that contain media files that should result in folder previews being
displayed are not displaying folder previews.

EXPECTED RESULT
The folder icons should include previews in them.

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Arch Linux, main Linux kernel, kernel version 5.16.9-arch1-1
(64-bit)
(available in About System)
KDE Plasma Version: 5.24.1
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
I can provide any additional information requested.

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