I've hit a bug with the tallneck in the DLC area.
Whenever I reattach one of its lost components, my movement gets locked.
Basically, anything the left stick would do in the game world no longer functions.
If I open the map, I can still pan around with the left stick.
In the world, I can still look with the right stick and do actions, but no running/turning.
Controller and keyboard/mouse, same issue. Can look, but not navigate (unless I roll in only one direction).

I was able to get around it by quitting to the main menu, and reloading, which put me back down by the sulfur pool outside Song's Edge, but otherwise did not lose progress.
However, this issue reoccurred when I replaced the second Tallneck part.

Not game-breaking, since it can be worked-around, but still a definite bug.