invisible and flickering ImageViews when moving along PathTransition and scaling the root parent

In my app I have Nodes moving through PathTransitions. If I scale the root Parent then the Nodes start disappearing and flickering.

I created some test code to reproduce. Run the attached file. Use the UP/DOWN arrows to scale the root Parent. Use the RIGHT/LEFT arrows to add and remove Nodes to the screen. To reproduce just add a lot of Nodes to the screen by holding down the RIGHT arrow and then start pressing the UP and DOWN arrow to scale. You should start seeing the Nodes disappearing. When this happens adding or removing another Node causes the problem to go away. a few times a took a minute or two for the problem to kick in, other times i happens right away.

thanks
jose