I don't have a current solution to your issue, however, I do know that the PG Music developers are very recently aware of further issues with Music XML, and that these are apparently being worked on now to resolve this. A patch is expected. When? I don't know.

Please see the threads in this post:
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=803583#Post803583


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