Is there a way to perform a callback when each follower has switched lines in this example? Or detect when they have done so?
In my case, I solved this by changing my path followers to physics sprites and using moveTo instead of paths.
https://photonstorm.github.io/phaser3-docs/Phaser.Physics.Arcade.ArcadePhysics.html#moveTo
Splitting up my paths caused delays between each path, so this works fine.