Missing Scroll Bar from Applications Folder in Dock

When I click the Applications Folder from the Dock in the Grid format, the scrollbar is missing. The only way to "scroll down," to other apps is by pressing the up/down arrow keys, in which the vertical bar briefly pops up but then disappears (no arrows pop up). I can view the Applications Folder as normal in Finder, but I prefer to just be able to click and scroll from the Dock.

I've tried switching from Fan to List to Grid to Automatic, etc. Whenever I return to Grid, there's still no scrollbar.

No scroll bar visible...

Vertical scroll bar shows up when I use the Up/Down arrows on keyboard, but then disappears again; no arrows visible.