We had problems with this script in various projects, Foundation Magellan seems not that reliable.
Magellan didn't use an JS Intersection Observer, what defenetily is the best solution to this topic.
We probably should deprecate the whole module (no D10 Release), instead we might create a neutral "Anchor Menu Block" module. I think we can copy over all the fields, the Intersection Observer basically accepts the same parameters.
Klick on a Anchor link, if the link is marked as 'active' or not is a thing of "luck", it depends on the the sites menu bar position, styling, .. or whatever.
Use an Intersection observer to solve this better.
See - for example:
https://www.smashingmagazine.com/2021/07/dynamic-header-intersection-obs...
https://codepen.io/michellebarker/full/xxwLpRG
https://codepen.io/michellebarker/pen/QWpzwYN
Active
1.0
Miscellaneous
As just discussed, a 2.x release for Drupal 10 would also be fine for me! Doesn't have to be a separate module, if it still uses the foundation classes.
Might happen in combination with Bootstrap change someday...