I build a hut. I wanted to use it as a storage. I went in. I dropped some wood and stone. It was gone. The hut has no inventory, the wood did not drop outside, trying to pick it up inside and outside of the hut did not work. It's gone. Very annoying. What is the hut for then?

The hut is not supposed to be used as a building, it's just used for decoration.
It's in the tutorial about Settlement when you decide to play along.
But why should the hut not be a building? If I recall correctly, then it was used in the old days as storage, "medic center" (heal the clonks) and a place to have Clonks wait if they are not needed currently. It was a great building.

Or in short: "does not fit into the directions taken and decisions made" (the missing possibility of interchanging contents is just one symptom of this being out of plan)
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