Heya jazminboult and RedRee225,
Lyndsay should teleport to the player and never be truly stuck. If that's happening with Lyndsay specifically we would love to get a video so we can get this entered as a bug.
Other NPCs can get stuck at any point along the journey to where they are headed next, not necessarily where the NPC is stopped/showing as stuck. You can try removing/moving things like conveyer belts, hedges, fences, etc. to see if it helps get them moving.
We're also working on a longer term solution, but in the meantime if you can try moving or deleting some things in the world that can help 😁