Strange phenomenon with tremolos

Mussescore 4.1.1. (the same thing happened in MS 4.1), Apple Ventura, newest update

Check the following example. The first line shows the tremolo beams after being entered. But I prefer the beams touching the stems and I converted.

The second line shows the passage converted by doing the following steps:
1. command - select all beams
2. go to "properties" and select the middle of the three framing options
As you see what I get is two missing beams. Really bizarre.
Musescore file is attached.