When exporting to .musicxml, pages with text aren't exported

Issue type

Engraving bug (incorrect score rendering)

Description with steps to reproduce

1. Create a score with one part/instrument
2. Add text frames at the end and on a second page (like lyrics for following verses).
3. Export the Main Score and the Part to .musicxml files.
4. Actual behaviour: it exports, but the Main score export doesn't include the second page, while Part export does.
   Expected behaviour: all contents export to musicxml.

Supporting files, videos and screenshots

The original:

Main score export:

Part export:

In which versions of MuseScore Studio is this issue present?

MuseScore Studio version (64-bit): 4.6.5-253511702, revision: github-musescore-musescore-653f38d

Regression

I was unable to check

Operating system

Windows 10 Version 22H2 or later, Arch.: x86_64

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

Reproduce the issue with a score containing text frames on a second page, then compare Main Score and Part MusicXML exports. Trace the separate export paths and identify why the Main Score omits later-page text. Done means all score contents, including text frames on subsequent pages, appear in the Main Score MusicXML export while the Part export remains correct.