Sometimes I have to drop the weapon into the slot 3-4 times before it equips. If I do not do that the thrall will not arm itself and fight. This includes archers and its an official server.
Thralls have a hard time crossing doorways like NPC’s do as well.
Least of our problems. Even if they kept the weapons equipped (this has been a problem for months) they are likely to just stand around and take a beating or die because they were reduced to 100 HP anyways.
Combat thralls are not reliable in any now, nor have they really been for the last few months.
Someday they might work properly, but who knows when.