MusicXml does not set the proper font when importing from MusicXml
When importing a score from MusicXml, MuseScore assumes a default font (freeserif for me), and if the text in the xml file has characters that are not defined in the default font they will not be read and shown properly.
Also setting the font to the correct one after importing does not fix this.
To test go to the link below and check out the mscz and xml score files.
First install the testserif font from the folder where I added an a character to 0xe000.
If you open the mscz file you'll see the symbol is shown correctly (a), while if you load the xml file you'll see a different symbol ("}" for me).
I reproduced this issue on both 2.0.2 and master branch.