MuseScore 3.0 Beta: Error message with measure with 9 groups

Hello, when I use MuseScore 3.0 Beta and try to open a mscz file that contains measures with 9 groups there is a corruption error message:

Measure 280, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 281, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 282, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 283, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 365, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 366, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 367, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 368, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 369, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 370, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 371, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 372, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 373, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 374, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 375, staff 3 incomplete. Expected: 3/4; Found: 264/288
Measure 392, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 393, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 394, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 395, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 396, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 397, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 398, staff 2 incomplete. Expected: 3/4; Found: 264/288
Measure 398, staff 3 incomplete. Expected: 3/4; Found: 264/288

MuseScore 2.3 opens correctly the same file.

I join the mscz file (the measures with the problem come from a midi file) and a screenshoot.

Sorry for my bad english.

Best regards,

Stephanie