I have the same problem. I see it for both PNG and JPG files, but only when I'm trying to open the file stored on my Linux fileserver using Preview. If I copy the file from the fileserver to a local drive, it works fine.
Preview is my default app for both PNG and JPG files, and this happens regardless of whether I double-click on the file or right click --> Open With --> Preview.
I only see this with Preview. If I right-click a fileserver-stored image file and open with Photoshop, it works fine.
And if I display the files on the fileserver in a Finder gallery view it also works fine showing thumbnails of the images.
Summary of what I've found:
Fileserver image file: Finder --> Open With --> Preview: FAILS
Local image file: Finder --> Open With --> Preview: SUCCEEDS
Fileserver image file: Finder --> Open With --> Photoshop: SUCCEEDS
Local image file: Finder --> Open With --> Photoshop: SUCCEEDS
I've attached a screenshot showing what the same file looks like in Preview opened on the fileserver vs copying locally.
I'm using a 2021 M1 Macbook Pro 14" with MacOS Sonoma 14.0 (23A344).
Michael
