I've noticed "device pairing issues" with MX Master 3 on Mac OS ("FIX ME" within Logi+). After deep diving, I found out, that in my case, they are caused by allowed input options from Login menu. Once I disabled them, advanced functions started working again (without need to restart laptop). I often lock and unlock laptop and I assume, that time to time, that "loginwindow" doesn't finish its stuff correctly.