This following problem is intermittent and seems to be without cause.
I have recently noticed the when adding an accent mark (5) to the hi hat it sometimes silences the note which does the exact opposite of what I'm intending for it to do!
I enter notes with my mouse and do not use any outboard gear for note entry.
I'm running Notion 6.8.2 Build 18133, 64-bit on an M1 iMac running MacOS Monterey 12.3.1