XML-import and export of beams over rests

1) create a bar with a random note that carries a beam (i.e. eighth note, sixteenth note etc.).
2) create a succeeding rest, rest value needs to carry a beam aswell (i.e. eight note, sixteenth note etc.)
3) mark the note and the succeeding rest, choose "beam middle" under "beam properties" for both

-> the result looks like this:

4) export as .musicxml
5) import that exact .musicxml-file

-> the result looks like this:

the beaming information is lost.

problems:
- this specific type of beaming information is lost in export
the export looks like this

- even when manually inserting all possible combinations of beaming informations (even music XML's nativ "forward hook" and "backward hook" that are exactly for this context), the beaming information is not retrieved and rendered in the importing process