So I decided to finish the tideborn quest (the Goshiki questline) today, and when I reached the Blood Combat part This (link)
The first part (to kill 15 undead soldiers) works fine. Then Goshiki and the Tideborn Warriors attack and they all run forward. The problem here is that the Tideborn Warrior npcs don't actually attack, but instead they just run into the wall on the right and get stuck.
I have no idea what caused this, and I had no problems finishing the actual quest, as the Tideborn Warrior npcs aren't needed for it. Only Goshiki is, to hand the quest in.
Just thought I would point this out, seemed weird..