Continuing the discussion from Announce: markdown-scroll-sync package:
My package markdown-scroll-sync never worked as well as I (and everyone else) wanted. I just did a total rewrite that works much better and is less buggy. It is markdown-scroll-sync version 2.0.1.
Try it, you’ll like it. (If you have ever been forced to watch yo-gabba-gabba with your kids that expression will make you cringe).