Created attachment 178370 [details]
demo of the bug

SUMMARY
Few days ago with recent updates, Dolphin thumbnailing system became bugged. If I start zooming in or out, the thumbnails on symbolic link files are way too off, compared to the original file's thumbnail. 
In earlier versions, when I had a symbolic link to a file, the thumbnail was the exact same dimension replica of the original file, and it was just perfect. For me it is extremely important for this to work again, because I work with a lot of media files, and usually I separate them with symlinks to sort them, but currently it is hard to see the thumbnails with incorrect zooming/scaling.
See attachment for better understanding, about the current bug.

STEPS TO REPRODUCE
1. Make a symbolic link to any kind of file next to each other
2. Go into thumbnail view
3. Start zooming in our out and see for yourself of how the thumbnail dimensions are different and wrongly scaled

OBSERVED RESULT
Thumbnail dimensions are wrongly scaled on symbolic links

EXPECTED RESULT
Thumbnail dimensions must be the same as of the original file's

Operating System: openSUSE Tumbleweed 20250211
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.13.1-1-default (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-6500 CPU @ 3.20GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1050 Ti/PCIe/SSE2
Manufacturer: MSI
Product Name: MS-7972
System Version: 2.0