Custom object property animation with onUpdate does not have like CSS properties

[RolandSoos]

On my Codepen both tweens have 2sec delay. Watch the animation and you should see that when the timeline plays again, the opacity set back to 0.5 at start of the timeline, but the custom property's onUpdate function is not called, so it stuck on 50 until the timeline reaches the 2s position. Is there any official solution for this case?

 

Update, seems like setting suppressEvents to false forces it to call the onUpdate at timeline's start:

tl.play(0, false);

 

See the Pen OrXrjX by anon (@anon) on CodePen

[RolandSoos]

Well, it makes sense. suppressEvents true, also suppress the child tween's events too.

[OSUblake]

You can use a property getter/setter instead of an onUpdate callback. 

 

See the Pen OrXqNd by osublake (@osublake) on CodePen