problem in Timeline tree view

If I have more tasks in the same row at the same time and I move at task from a row to another row, the task maintain the y position respect to the row.
How to replicate it using samples\06_timeline\03_tree.html

  1. Create new “task 4” and “task 5” in the first row under “Task A-64168” See attached image
  2. move “task 4” in the the row below and the task is cut in height. See attached image
  3. move “Task 5” in the row below and the task disappear.

it is a known problem and it appears to be fixed in dev version of the component. fix will be included into upcoming release.