Selection of non-expanded non-leaf treeItem grows unexpectedly when adding two-level descendants

On a TreeTableView, with multiple selection enabled, when a non-expanded non-leaf node, that has at least two levels of descendants, is selected, the selection grows unexpectedly to the next sibling of the top-level node, once a new treeItem is added to the second (or deeper) level of the selected item.

The attached test shows the issue.

- Node 0 (non-leaf) is selected and not expanded. It has as child Node 1, which also has Node 2 as child.
- Node 3 is a sibling of Node 0.

When Node 4 is added as sibling of Node 2, Node 3 gets selected unexpectedly (see attached picture).

This issue can be reproduced with any JavaFX version and platform.