After installing this beta, my custom action on the MX Master 3 mode shift button (hold and pull down) only performs the action once, no matter how much I continue sliding the mouse down while holding. The prior behavior was to continue performing the action, which allowed me to hold the mode shift button and slide down/up to quickly change the volume multiple ticks at a time. Now it requires repeated stops and slides to accomplish the same task (e.g., to change the volume from ~25% to ~50% takes three full slides up my mouse pad while holding the mode shift button).