Building next to/against large trees causes gap in shelter

Game mode: Singleplayer
Problem: Bug
Region: Ontario Canada

I built a small structure up against one of the large trees. While normally the building would have been completely closed/finished off (walls, and roofs complete) it did clip through a portion of the large tree’s trunk - the structure pieces were still there, they were just inside the trunk a bit.
After structure was complete, while inside, I noticed that near the tree, the little shelter icon dropped to half, then closer to the tree, it went away, indicating there is a spot there that has zero shelter.

Steps on how to reproduce issue:

  1. build near/against/into a large tree. (Building would be completely enclosed if not built beside the tree)
  2. move around inside structure. Notice closer to the tree, it appears that the shelter is reduced, then absent.