Menril Tree have a visual conflict with HT's TreeChop. It'll allow you to see through the ground including cave mazes while chopping the tree.

Here is the video: https://www.youtube.com/watch?v=nA-H9LqEeUU

This seems like an issue with HT's TreeChop mod. Please report it to their issue tracker and link back here.
Happy to make changes here if that would be required.