Key signatures containing only natural signs disappear when preceded by frame+system break

[kisokos03]

Issue type

Engraving bug

Bug description

musescore doesn't show natural signs in the key signature after a key sig. change when it's applied to a bar after a horizontal frame, where the break is at the end of the previous line, and the key change bar is at the beginning of the line after. This behaviour is irrespective of the "show natural signs in key signature" option in the style popup.

It looks like musescore isn't displaying the "change of key" because of the frame and only the actual "new key signature" which happens to be blank.

Steps to reproduce

1. Create a new score, adding any (tuned) instrument
2. Set the key to one with accidentals (ie not C/Am)
3. some bars later revert back to C major
4. insert a horizontal frame to the bar of the key change back to C
5. select the frame and add a system or page break to it
6. natural signs no longer appear on the new system/page

Screenshots/Screen recordings

https://github.com/musescore/MuseScore/assets/54271869/8d13caf9-d40a-4979-8976-002b1cb5cf5c

MuseScore Version

MuseScore version (64-bit): 4.1.1-232071203, revision: github-musescore-musescore-e4d1ddf

Regression

I don't know

Operating system

Windows 10

Additional context

No response

[Jojo-Schmitz]

It seems to be a Mu3 regression

[Jojo-Schmitz]

Isn't #22256 a dupicate?

[sammik]

Just to notice: It is not Key sgnature on new signature, what is missing, but courtesy key signature at the end of previous system is missing.

[dcorson-ticino-com]

Maybe MS is interpreting the break to be like a section break for a new movement. In that case it is not customary to at the courtesy key signature.

[sammik]

Maybe MS is interpreting the break to be like a section break for a new movement. In that case it is not customary to at the courtesy key signature.

I dont think so