Not working: Up/down arrow keys to change numerical values in the right side bar

On the Figma Webapp when using the Arc Browser, I can’t use the up/down arrow keys on my keyboard to change numerical values incrementally on any of the object properties on the right sidebar. I’ve checked this behavior in google chrome and it works fine on there. I figure it might be only this instance of Figma running on the Arc browser. Any thoughts if there is a way to turn this function back on?