Drumkit Flams and Midi Export

Hello,

I'm using latest musescore (4.4.2/win) and trying to export some drum scores to midi but it looks like flams (note + grace note) are not exported correctly. The grace note plays as a regular one and sounds like offbeat.
I've attached a simple score and the resulting midi with the issue.
Am i doing something wrong? Is there any known workaround?
Thanks for any suggestion!