Plain Classes field in Oxygen Classic Builder

I don’t know if it’s just my WP and Oxygen Classic instance or if this is the intended behavior, but the Plain Classes field tends to hog focus whenever an element is selected in the builder. So if I try to paste an element inside the selected element, the code for the element gets pasted in the Plain Classes field instead.

I’ve even had instances where I’m trying to use the code editor for an Easy Posts module or repeater, and the Plain Classes field keeps stealing focus away from the editor.

This is highly bothersome and obnoxious behavior that’s disruptive to my workflow. Plain Classes should only get focus when I give focus to it by clicking in the field.

Is there something that can be done about this in short order?