Opening MusicXML Files

Hi.
I'm in the process of moving a number of files from Sibelius format into native Musescore format. So I'm going via MusicXML in between. Most open okay, but I've got some that don't work. They cause Musescore to crash every time. I've attached one example (I Surrender.mxl).

I've spent a while looking in the issue tracker, to see what might be relevant.

I saw that this is an issue to me:
[#283041]
Musescore 3.0.2: Writing workspace file failed (in Preferences/when exiting)
I wondered if that might simply be because I've caused Musescore to crash out so much. But I guess quite a few people could be experiencing that one, and the temporary workaround fixed that issue for me. The MusicXML still won't load though.

This could be the issue I'm still experiencing:
#282547: XML Import of certain malformend file crashes MuseScore 3
XML Import of certain malformend file crashes MuseScore 3
But how do I find out if the XML is malformed? And is there any workaround for this?

Details:
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.0.2.5312, revision: 8ca4d2c.

Thanks
Dave