1.9.6 - color label incorrect

[Kadet]

Version 1.9.6 for Win 11 stopped showing my defined label color for jxl and webp files that I added a long time ago. Changing the color to another one does nothing. Avif files are correct.

[update]
It is more complicated. In one folder few files look correct, but the color of older files does not. When I deleted the thumbnails in some folder, all the files had the correct label colors.

[xnview]

label color is saved in XMP metadatas?

[Kadet]

I mean this:

Color-label.jpg

[xnview]

if you 'rebuild thumbnails' on the 2 PDF, is it working?

[Kadet]

Yes. If I rebuild thumbnails, all the wrong colors for pdf, jxl, webp are changing to good colors.