Can't scroll up and down the image gallery when in the new "Crop and Expand" tab

MacOS, ACR 18.4.1

In the previous versions of ACR _before_ the new AI Expand tool, I could scroll up and down images on the left hand side gallery while in the “Crop and Expand” tab (just like in all the other tabs like in “Edit”, “Remove”, etc.) with arrow up and arrow down on the keyboard.

Now it’s not the case anymore.  I can’t scroll ONLY in “Crop and Expand.”  My guess is that the addition of AI Expand has broken or disabled the arrow key scroll feature.  Please fix.  Thanks.