Attached program shows a tree with a custom cell renderer that uses setGraphic(...) to render the nodes. When the window first appears, the nodes under "B" don't appear. When moving your mouse over the nodes, the appear, disappear and change sizes in weird ways. Also, resizing the window makes nodes appear and disappear. Just using setText(...) in the renderer works fine.

ListView has a similar issue where nodes change sizes/padding. However, TreeView suffers the most by far.

I haven't tried TreeTableView.