To be clear, you are referring to having a crafter thrall (not archer/warrior/barkeep) in your Inventory, and you are opening the Crafter station you want, such as Smelting Forge, and then are tryoing to click-drag from your Inventory into the available single slot in the craftstation?
Correct, crafters (not archers, not priests, not fighters, not barkeeps). Also, I can’t even put these crafter thralls back in any storage chest. These are most likely thralls I looted from a decaying base about 6 months ago and I have had them in storage for like 6 months or more. I built a new base and not even the appropriate crafting bench will accept them (in the thrall spot or in the bench storage itself). Several days have passed, I have relogged multiple times and left render range and come back - tried everything so I would rule out a sync issue. Literally the only thing I can do with these thralls is drop them on the ground and pick them back up.
It’s like the new the new age is already applied to my character on an official server. They also won’t stay in my hotbar (automatically pops back in my inventory when I drag to a hotbar). No matter where I try to put the thrall, it pops back in my inventory nearly instantly.
Edit - just tried this today. If I spam click to move the thrall many times I was able to randomly get it to move to a storage chest or bench - but it’s random and takes a LOT of clicks to move - and sometimes even after a few hundred clicks to transfer to a bench it does not work.
So I figured out a work around. I use quick stack, it moves everything from my inventory to the bench and then (and only then) I can place the thrall in the crafting spot. So odd and took a lot of creative ways to make it work in crafting benches. This is much better than spam clicking hundreds of times.
So now I can’t use my axe or hatchet- I put them in my hotbar and they pop back into my inventory. This is beyond frustrating - can’t even play the game really.