The below was reported by another player in September/October 2020. I am currently having this same problem:
When keeping a movement button depressed (mouse1 in my case) and the navigation cursor ‘hit’ a friendly but non-interactable NPC the player character movement is instantly stopped and stuck in the animation state it was in before the cursor ‘hit’ the non-interactable friendly NPC. Reproducible pretty much everywhere where there are friendly but non-interactable NPCs.