No-beam information lost when importing from MusicXML

1) Create a score of a couple of quaver notes, set their beam properties to "No beam". (attachment Untitled.mscz)
2) Export as MusicXML (uncompressed, for easier inspection; attachment Untitled.musicxml)
3) Import the exported file.
-> The quaver notes are now connected by beams, their beam properties being set to "Auto beam"

Explanation: Setting "Auto beam" may be sensible when importing from a MusicXML file that does not include beam information. But when the imported file indicates , absent beam tags must be interpreted as "No beam" - AFAIK there is no way of specifying the absence of a beam more explicitly in MusicXML. Therefore this is clearly a bug.
Curiously, this worked as supposed in MuseScore 2.1.

Note: This functionality is paramount for a project of mine, where I planned to use MuseScore for creating stave transcriptions of ancient music, via a MusicXML rendition of the data. Here beams (and their absence) describe crucial aspects of the data.