Camera rises in 1x1 holes [may be duplicate]

NOTE: this may be a duplicate of another bug that I have seen mentioned but without a reference on this site for me to link it - ‘sometimes when getting near lava or water that’s flowing down, you will lift slightly off the ground as if you are in it‘

When I walk into a 1x1, 2 block deep (with one block taken out to get up and down) hole, the camera rises and I can see out. Placing a block above my head in the hole undoes this.

What I expected to happen:
I would walk down into the hole, and my camera would be level with the top of the grass block in the side of the wall.

What actually happened:
The camera rose above the grass block, showing the area above.

Steps to reproduce:
Make a two block deep, 1x1 hole. Remove one block from the sides to act as a staircase. Walk down into the hole.