MuseScore forgets customized colors after closing and reopening (Windows)

[spscores]

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

1. Select an item to color it, and clic "Add to custom colors"
2. Close MuseScore.
3. Reopen it and try to color any object: the custom color added before has vanished

Supporting files, videos and screenshots

Color added in custom:

After closing and reopening MuseScore (and with the same score)

In which versions of MuseScore Studio is this issue present?

4.6 (it worked untile 4.5.2)

Regression

Yes, this used to work in a previous version of MuseScore 4.x

Operating system

Windows 11

Additional context

No response

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

[cbjeukendrup]

This colour picker, including the "Custom colours" section, is provided by Windows, via Qt. I wonder how this behaves in other apps; it might be the case that this can't controlled by us.

[cbjeukendrup]

Lacking a response, I checked it myself: same behaviour in MS Paint. So it's a Windows issue.