On Ubuntu 26.04.1 LTS:

Upgrade: libglycin-2-dev:amd64 (2.1.1+ds-0ubuntu1, 2.1.5+ds-0ubuntu0.2),
libglycin-gtk4-2-dev:amd64 (2.1.1+ds-0ubuntu1, 2.1.5+ds-0ubuntu0.2),
libglycin-gtk4-2-0:amd64 (2.1.1+ds-0ubuntu1, 2.1.5+ds-0ubuntu0.2),
glycin-loaders:amd64 (2.1.1+ds-0ubuntu1, 2.1.5+ds-0ubuntu0.2),
gir1.2-glygtk4-2:amd64 (2.1.1+ds-0ubuntu1, 2.1.5+ds-0ubuntu0.2),
gir1.2-gly-2:amd64 (2.1.1+ds-0ubuntu1, 2.1.5+ds-0ubuntu0.2),
libglycin-2-0:amd64 (2.1.1+ds-0ubuntu1, 2.1.5+ds-0ubuntu0.2)

Verified that the sample image can be edited, and displayed again
without any distortions.

** Description changed:

  [ Impact ]
  
  The default Image Viewer in Ubuntu Desktop fails to save some JPEG
  images after editing.
  
  This is because it was previously being assumed that all JPEG images
  would use a ycbcr color space, while it turned out that rgb color spaces
  may also be used.
  
  https://gitlab.gnome.org/GNOME/glycin/-/work_items/274
  
  [ Test Plan ]
  
  1. Download the attached sample JPEG file
  2. Open the image in Image Viewer
  3. Enter edit mode
  4. Flip the image horizontally
  5. Verify that you can save the edited image
+ 6. Verify that you can view the edited image without visible distortions
  
  [ Where problems could occur ]
  
  Glycin is the image decoding/encoding library used by across GNOME projects.
  Issues may manifest in any GNOME applications that use gdk-pixbuf or glycin 
to load/save images.

** Tags removed: verification-needed-resolute
** Tags added: verification-done-resolute

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2160025

Title:
  Image Viewer cannot save JPEG image after editing

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