kenma's post in ScrollTo plugin not firing after first trigger in a Timeline was marked as the answer
Thanks for the quick response. I actually figured out a clean workaround shortly after making the post. If it helps with diagnosing this issue: I already had autoKill: false set without any positive effect.
I fixed this by adding an onComplete hook to my TimelineMax, firing a TweenMax.to(..scrollTo..) animation, giving me the desired effect.