Created attachment 167562 [details]
multiple test files for dolphin thumbnailing, detailed files info, screenshots (bug and comparison)

SUMMARY
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Dolphin does not create thumbnails for many types of common photos, as it used to. Its difficult to recognize a photo from a collection.
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STEPS TO REPRODUCE
1. Open the folder in Dolphin with the attatched test files.

OBSERVED RESULT
No thumbnails for many type of common photos in Dolphin.

EXPECTED RESULT
Thumbnails for common type of photos.

SOFTWARE/OS VERSIONS
dolphin 24.02.0
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Graphics Platform: X11
Graphics Processor: Intel HD

ADDITIONAL INFORMATION
libpng 1.6.43-1
libjpeg-turbo 3.0.2-2
openjpeg2 2.5.2-1
libjxl 0.10.2-1
libwebp 1.3.2-1
webp-pixbuf-loader 0.2.7-1
libavif 1.0.4-1
libheif 1.17.6-3
kimageformats 6.0.0-2 (kf6)
qt6-imageformats 6.6.2-1 (qt6)
ffmpegthumbnailer 2.2.2-5
ffmpegthumbs 24.02.0-1
kdegraphics-thumbnailers 24.02.0-1
kdesdk-thumbnailers 24.02.0-1
raw-thumbnailer 0.2.1-7
dcraw 9.28.0-4
libopenraw 0.3.7-1
libraw 0.21.2-1
libtiff 4.6.0-2
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qt5-imageformats 5.15.13+kde+r7-1 (qt5)
kimageformats5 5.115.0-2 (kf5)