What is the problem in question? The OP originally referred to the problem of “thralls walking through walls”. He stated himself, as well as @Barnes, that they couldn´t easily reproduce this phenomenon later on:
Indeed, I had the problem even before the patch, that at my base at the scorpion boss next to the Unnamed City, fighters and archers tended to change their assigned positions and appeared in front of my gates to fight the boss. So with the patch now things got better regarding this issue?
Different issues like thralls dying from fall damage or archers not staying on their platforms should be adressed in a separate post since they were not in the focus here.