EeleanorawesomeJun 5, 2020 at 9:02 pm
after pressing the S or M button in layers to make only that layer visible or hidden, the key shortcuts stop working until an action is performed such as using the current tool on the canvas or pressing a button on the UI

DanikJul 16, 2020 at 3:28 pm
Thanks for reporting, it is now fixed for the coming release.