QML TreeView beginInsertRows broken when expanded

I noticed that incrementally updating the model view for a QML TreeView using beginInsertRows and endInsertRows doesn't work as expected when the rows are expanded.

My tree looks as follows:

• root
  • node1
    • subnode1
  • node2
    • subnode2
  • node3

When I insert a new node between node2 and node3 using beginInsertRows(rootIndex, 2, 2), the new node4 is shown after node3, which is wrong.

However, when I fold/close the expanded node2 branch and do the same insert, the node4 is correctly inserted between node2 and node3.

I verified that my model is not the problem, but instead, the QML TreeView seems to behave incorrectly. Emitting layoutChanged() after the insert operation correctly updates the TreeView.