Can't hide courtesy key signature

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

Firstly, I'm not sure which type of issue is this, could be UX/Interaction bug or Engraving bug. It's probably Interaction bug. The recent addition of "courtesy key signature" isn't able to hide after saving (I specifically saved mine in the cloud. In this situation I used the following:

1. Use D.S al Coda
2. Add "To Coda"
3. The Coda (with the coda symbol) section has different key signature (which is correct in this case)
4. Hide the "To Coda" courtesy key signature in the brackets
5. Save the score
6. Reopen the score, it'll come back as visible.

Supporting files, videos and screenshots

Sheet score sample measure #68
https://musescore.com/user/69102031/scores/28954763/s/JA_tbT

In which versions of MuseScore Studio is this issue present?

4.6.3

Regression

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

Operating system

macOS 26 Tahoe

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