Since KOGITO-4977 the toolbox menu has white bg color, so menu items are properly visible and accessible in case it overlaps any label.

On the other hand, when node is placed inside a Lane, the toolbox background does not looks pretty:

Other issues with toolbox
When task resized toolbox bounding box isn't updated automatically, node should be reselected:

Resize control point in active mode is overlapping with toolbox for default task size: