Created attachment 178964 [details]
Zip file containing a bug report, screenshots, and 3 example KRAs to check out.

SUMMARY ---------------------------------------------------------------------------------------------------------

Gradients in Krita duplicate, alter, and display incorrectly after reopening a .kra file.
This appears to affect:
* Gradient Overlay (Layer FX)
* Outline Fill (Layer FX)
* And other gradient based panels show a wrong/depreciated thumbnail.

Issues observed:

Wrong gradient thumbnails for gradients &
Re-selecting a gradient does not match its thumbnail

STEPS TO REPRODUCE ---------------------------------------------------------------------------------------------------------

1. Create a new document (at least 512x512 px).
2. Zoom in after creating the document.
3. Draw a rectangle filling the entire canvas.
4. Apply the “GPS Eye (Blue)” gradient in one of these ways:
5. Gradient Overlay (Layer FX)
6. Outline Fill (Layer FX)
7. Vector Shape Fill Gradient
8. Save the .kra file and close Krita.
9. Reopen Krita and observe:
10. Colors are missing or altered.
11. Duplicate gradients appear in presets.
12. Vector gradient thumbnails are incorrect.
13. Selecting a gradient applies a different result than the preview.

OBSERVED RESULT ---------------------------------------------------------------------------------------------------------

* Gradients are altered on reload.
* Duplicate gradients are created.
* Vector gradient thumbnails are incorrect.
* Re-selecting a gradient applies the wrong colors.

EXPECTED RESULT ---------------------------------------------------------------------------------------------------------

* Gradients should remain unchanged after reopening.
* No duplicate gradients should be created.
* Thumbnails should match actual gradients.

SOFTWARE/OS VERSIONS ---------------------------------------------------------------------------------------------------------

Operating System: Nobara Linux 40
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1

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ATTACHED ---------------------------------------------------------------------------------------------------------

LOG: (Attached) 
SCREENSHOTS: (Attached) 
EXAMPLE KRAs: (Attached)

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ADDITIONAL INFORMATION ---------------------------------------------------------------------------------------------------------

Hardware: Intel i9-13900HX, NVIDIA RTX 4090, 31GB RAM

Always breaks with with layer FX, doesn't seem to break for vector gradients as much it just breaks the thumbnail sometimes.

POSSIBLY RELATED:

* https://www.reddit.com/r/krita/comments/wx99bm/is_saving_gradient_maps_borked_or_am_i_missing/

* https://bugs.kde.org/show_bug.cgi?id=445390 (Very likely a duplicate, suggesting a ticket merge.)

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FINAL WORD:

Thank-you Krita devs for your software. I may be here reporting a bug, but I love Krita. You have freed my from the Adobe curse and I am eternally grateful. It's an honour to do my part where I can.
Unlike every bug report that seemed to fall on deaf earts with Adobe, I feel my time is wisely invested. :) 
I just see you guys copping way too much flack from randoms on the forum when this to me is the best free Photoshop replacement I have ever encountered. (And I have tried GIMP... a lot.) I think your free opensource product is actually comparable to the likes of Affinity Photo. I think together we can do anything we put our minds to empower artists.

Keep up the good work, and don't hesitate to reach about anything.

-S