Darkrooms filmstrips thumbnails use embedded jpeg instead of raw preview

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

The thumbnails in the darkrooms filmstrip seem to use the embedded jpeg until the image is edited after the initial import. Only then the thumbnail actually represents the main preview and the darkroom seems to ignore the thumbnails generated in the lighttable after import.

Steps to reproduce

Import some photos
Go to darktable
Skip through them e.g. by using the spacebar; observe how the currently opened photo is represented correctly in the filmstrip while it's neighbours show the embedded jpeg
Make some change to a module; go to next photo; observe how the thumbnail now represents the edit.

Expected behavior

I would expect the darkrooms thumbnails to match the previews generated on the lighttable

Logfile | Screenshot | Screencast

https://github.com/user-attachments/assets/a768ea29-d8e9-4c9d-9ece-4f311b0b11ba
Note: "use raw file instead of embedded jpeg from size" is set to "always" and previews on the lighttable show the raw-preview, not the jpeg preview.

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

Darktable-5.3.0+901.gbaff9166fd-x86_64

What OS are you using?

Linux

What is the version of your OS?

bazzite 43

Describe your system

nvidia rtx 2060; KDE Wayland

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

nvidia rtx 2060

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

Start by reproducing the behavior in darktable's darkroom and lighttable: import photos, compare filmstrip thumbnails while moving with the spacebar, and edit one image to observe the change. Trace how the darkroom filmstrip obtains thumbnails versus the lighttable previews; done means thumbnails consistently match the raw previews before any edit.