Landing pad not being displayed when tree is not virtualized

[rrhvella]

When dragging nodes around in a non-virtualized tree , the landing pad is not displayed. This behaviour works on virtualized trees. While debugging I found that the issue is caused by this css declaration for the ::before element of the landing pad.

https://github.com/fritz-c/react-sortable-tree/blob/2145c14053ab20df356606d8e7ecb5cd3a868309/src/node-renderer-default.scss#L40

What is the purpose of this declaration?

I replicated this on chrome and firefox.