TAB - Mixing mensural value symbols and beaming in historic tablatures is broken

OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.2.3.7635, revision: d2d863f

In September 2015, Maurizio Gavioli (@Miwarre) wrote this code: https://github.com/musescore/MuseScore/commit/6cab2d0f3bcb4e832aaabfa95…
For implementing this historical TAB style: https://musescore.org/en/node/81051

Unfortunately, this style has been broken somewhere with the version 3.

For the uninitiated users, this is how it was done in concrete and succinct terms.

After choosing a certain configuration (Letters ; Fret marks: Font = Tab Renaissance; Notes values: Font = Italian Tab, and Note symbols Repeated Always, see attached test file: broken beam grid.mscz ), you got this by default, for two quarter notes and four eighth notes, e.g.)

With this feature, for editing the wished beaming, it was a question of defining the note groups (the group of two quarter notes, and the group of four eighth notes, by double-clicking - or shortcut to define - on "Beam Start" on the first note/fret of each group)
And by navigating with the right arrow, you had to double-click (or shortcut) on "Middle Beam", and so to get this kind of "pretty" and historical TAB beaming.

Like this (the letters in green are for "Beam Start", and the letters in blue, for "Middle Beam")

And so, unfortunately now, it doesn't work anymore (the Middle Beam at least, I don't know) and you receive this wrong display :(