Beaming in 4/4 changes after joining measures to make a cadenza

[DaddyLudwig]

Issue type

Engraving bug

Bug description

I was working on Mozart's Fantasia in D minor yesterday and I reached the first cadenza. So I put in all the notes of the cadenza and then joined measures. And then I adjusted the beaming of the sixteenths to match the score. And then I put in the Tempo I and I noticed that the eighths started to beam in 2's instead of 4's for some reason. At no point did I adjust Time Signature Properties, so I figured it had to have been the joining of measures that triggered it.

Steps to reproduce

1. Open the score
2. Add some eighth notes after Measure 34
3. See that the eighths are beamed in 2's

Screenshots/Screen recordings

https://github.com/musescore/MuseScore/assets/6530761/4561c9a2-3df4-401a-aa7b-ac6a9b85656b

MuseScore Version

MuseScore 4.0.2

Regression

I don't know

Operating system

Windows 10

Additional context

Fantasia in D minor K 397.zip

[Lynzzyr]

I might have the same issue. I'm working on a relatively large orchestral piece, and at some point, the beam groupings for 16th notes changed from being beamed in 4s to being beamed in 2s "within" 4s, as shown below. Both measures have common time as the time signature, and the only different thing I can think of that could have made this happen is that the second image contains a reduced measure.

This isn't that big of an issue, but I would like this addressed, as the inconsistent styling is a little weird.

UPDATE: I found that the issue was solely caused by the shortened measure in the second image. Expanding it to have the normal 4 beats removes this issue completely for all measures following this one.