I have noticed this with the last 3 TestLive patches. Log out of the game and they are Thralls. Log back in and this is what you have.
This was taken just before creating this thread.
This is what i found Saturday, 23 Feb 2019.
Both were normal thralls prior to logging in to the game. In all cases that I have found this, They cannot be interacted with. The only option is to kill them and risk harming nearby thralls that come to your aid.
Since they cannot see what you are attacking, they get in the way. Once the Entertainer is killed, they appear as the thrall.
Edit: I did not post this as part of the CtA since I discovered it in the build prior to the current build. I did see the same thing happen about two months ago.