I am looking to use ScrollTrigger with the scrub option to control a GSAP timeline, but only updating the progress of the timeline/tweens when going forward in a position that has to be progressed.   I did take a look at this post that says to use the onUpdate callback event to update the progress, but for some reason it's not working with how I set up the animation. When I scroll down half way through the animation and start scrolling back up, the progress reverses.   From t