All Purge Defenses Broken!

Game mode: Online
Problem: Bug
Region: US

There is nothing I can do to protect myself from an offline purge anymore. Thralls don’t attack and just stand there. I cannot place wooden palisades anymore that damage enemies because I always get the error that the terrain or object is blocking placement even if I place it on level ground away from objects.
What else am I suppose to do to protect my bases from purges if all the defenses are broken?

Steps on how to reproduce issue:

  1. Try to place wooden palisades
  2. Watch placed archers/fighters sit around and do nothing as base and PC is attacked.