Hang/crash by copy-paste all a system of linked staves containing lines

GIT commit 4f8cd13 / Windows 10

I do not know if this is "the cause," or a cause, or a variation of other related issue. Anyway, I can reproduce rather easily, all these messages appearing when MuseScore can not open a file:

These bug reports are more numerous on the forums, for example, inter others:
- https://musescore.org/en/node/90211
- https://musescore.org/en/node/102541
- https://musescore.org/en/node/56956
- https://musescore.org/en/node/89781
I am able to reproduce from scratch those failure messages. Eg with two new files created the last few minutes:
- test 2.mscz
- My_First_Score.mscz

How? The problem occurs in a score with several linked staves (and it is tenfold if you add parts), and by copy-paste several lines (except Voltas which appear only on the top staff).

The main point, and this is perhaps the mistake committed by users (?) is that, to reproduce this issue, you must selecting not only the first staff (which would sufficient, since the staves are linked) but ALL the system of x linked staves. Ie:

So, for reproduce:

1) My First Score
2) "I" -> Add 5 linked staves
3) Add eg a crescendo in the first measure, a decrescendo, a trill line and a pedal line in the following measures, or open this test file: test.mscz
4) Select ALL the system (the first four measures for the six linked staves)

5) Press R key 3 times. If works always (not really hanging), press R key a fourth time. From
here, the programm is hanging (eg click on it to accelerate the process if needed)

However, from here, it is possible (not always) after a long time to wait, to "save as" the score.

Then, when you close the page with the "X", you receive "really" the crash. And when you want reloading the file, you get a failure, as described above.