improve musicXML import (from sibelius export)

Hi all!
I try to import score that was crated from sibelius as musicXML.

I discover that have several format issues:
- chord names aligment are incorrect
- invalid characters on chords names, example: F# -> F(c) on measure 17
- lost chords (ej measure 21, original have A and Asemi, imported have only A+-
- free text with lyrics (end of pages) lost line breaks and formating.

i attach example files:

2) sibelius export as pdf
3) sibelius export as xml
4) musescore imported mscz
5) musescore exported ad pdf

thanks!