Empty bars and a corrupted file after trying to Explode

1. Open "mscore_empty_bar.mscz" below
2. Select bars 3-4 in the Trumpet 1 part
3. Click Tools > Explode
4. Press Ctrl+Z to undo
   The result is "mscore_empty_bar2.mscz", a corrupted file. Bars 5-6 are now empty for Trumpet 1, even without rests. This messes up some stuff later in the file too, like rests and notes at the same time (I'd rather not share too much of the original file here though, just tell me if you need more context).

Note: just the initial explode already goes wrong, since voice 1 gets moved down and voice 2 stays instead of the other way around. Also, the next two bars go blank.

This happens on both my Windows 10 computers.

OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.4.2.9788, revision: 148e43f