Can't put things on wall

After placing one item on a wall, I become unable to put anything else on the same wall.

Steps to reproduce:

  1. Put something on the wall
  2. Try to put something else on the wall

Expected Results:
put everything I want on one wall

Actual Results:
can only put one item on the wall

There should be a red X on the wall where my cursor is, but it doesn’t appear in the shot. The cursor is on the wall and trying to place a second flower pot.

Version Number and Mods in use:
no mods, latest unstable build