MusicXML exports chord symbols on grand staves incorrectly, moving them to the top staff

[TeeDeeY]

Issue type

Import/export issue

Bug description

Chord symbols on grand staves are not correctly exported to MusicXML.

1. Start new score with a grand staff instrument.
2. Enter multiple chord symbols, some on the upper staff, some on the lower staff.
3. Export the file to MusicXML.

On importing the file back into MuseScore, all chord symbols have moved to the upper staff.
It has been confirmed that this is an export problem rather than an import problem.

MuseScore Version

checked in 4.4.1, but also occurs in 4.3.2; earlier versions have not been checked

Additional context

This issue has been significantly edited by @cbjeukendrup, because previously it discussed not only this MusicXML export problem but also a MIDI export problem that turned out to be unrelated.

[MarcSabatella]

FWIW, I don't see any issue with MusicXML export mmissing chord symbols on Linux using 4.4.1), but I can confirm that the playback of the chords is not included MIDI export. It is the case with MusicXML that the chords all end up being attached to the top staff even if originally entered on the bottom. Not sure if that's an import or export issue, or if it's a regression, or if it's at all related.

I do seem to recall there was an issue where chord symbol playback was not exported on Windows or macOS only, but I don't see an issue about this, open or closed. This too might not be related, or I might be remembering incorrectly...

[Jojo-Schmitz]

I can't confirm the MusicXML issue with chord symbols moving to the top staff or getting lost

[MarcSabatella]

For me it is specifically with a grand staff (not multiple instruments) that chords migrated between staves top. I have now verified the problem is on export as opposed to import, and that it also occurs in 4.3.2

Here is the test score I am using -
chord-symbol-export.zip

Here is how it looks when loaded:

and here is how it looks after export/import:

[TeeDeeY]

When I opened the original issue, the chords were scrambled up between export and subsequent import. That part of the issue seems fixed. I thought the midi export issue could be related so I listed it. My Mxl issue is closed but others can continue to the new issues that have come up. The midi issue continues in the other thread.