Request from the developers to test something on macOS, specially 10.14

Hello macOS users!

One of the MuseScore developers here. Could you please do us a favour by testing something:

• If you are using macOS 10.14, could you tell us if the problem described at https://github.com/musescore/MuseScore/issue/15500 does or doesn't occur for you?
• If you are using a newer version, could you tell us only if the problem does occur?

This will help us to come up with a sensible fix.

Thanks!