Incorrect mapping of Drumset instruments when exporting to XML

Issue type

Import/export issue

Bug description

When exporting XML (compressed or uncompressed) from MuseScore 4 (OS: Windows 10 Version 2009 or later, Arch.: x86_64, MuseScore version (64-bit): 4.2.1-240230937, revision: github-musescore-musescore-d757433) the drum mapping is completely out of wack (not just transposed). Tested by importing into Reaper.

Exporting to midi the mapping is spot on:

Github apparently won't let me attach the files xml or midi files so find attached zip...
BRN-Kick+Snare+hiHat.zip

Steps to reproduce

1. Create one bar loop using Drumset.
2. Export it using Music Xml (compressed or uncompressed)
3. Import it into your Daw (Reaper in my case)

4. Play loop/examine midi to see mapping is all wrong
5. Do the same but Exporting to midi then importing to DAW and the mapping is correct

Screenshots/Screen recordings

MuseScore Version

OS: Windows 10 Version 2009 or later, Arch.: x86_64, MuseScore version (64-bit): 4.2.1-240230937, revision: github-musescore-musescore-d757433

Regression

Choose option...

Operating system

OS: Windows 10 Version 2009 or later, Arch.: x86_64, MuseScore version (64-bit): 4.2.1-240230937, revision: github-musescore-musescore-d757433

Additional context

No response

Reproduce the issue with a one-bar Drumset loop in MuseScore 4.2.1, exporting both compressed and uncompressed MusicXML, then compare the imported mapping in Reaper with the MIDI-export path. Trace the MusicXML export and drum-instrument mapping entry points; done means the MusicXML-imported loop uses the same drum mapping as the correctly mapped MIDI export.