Crash on arrow button navigation in horizontal continuous mode

[svetter]

Issue type

Crash or freeze

Description with steps to reproduce

1. Create a new score
2. Change to horizontal continuous mode
3. Press Alt+Right arrow key (Note 'Vertical frame' in status bar)
4. Press Right arrow key

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/81f595ce-0b9f-4de8-bfd8-27be7f455cf2

MuseScore_240827_161220.log

What is the latest version of MuseScore Studio where this issue is present?

db77a84e

Regression

I was unable to check

Operating system

Windows 10

Additional context

No response

Checklist

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