Tried to search, but didn't find it yet described in this forum.
But its a fun one:

Swapping container into itself makes it inaccessible.
Beta, 1.0.93

Howto reproduce:
Start a new (Singleplayer) game, open inventory, open backpack.
Put something (eg. resurrection scroll) into the backpack.
Drag item from the backpack and drop it onto the backpack-icon in the inventory.

What should happen:
? Probably this operation should not be allowed.

What does happen:
Item is back in inventory in the slot of the backpack.
Backpack icon vanished.

Upon closing the backpack-content-window the backpack is entirely unaccessible.

Comment:
Normally, if an item is dropped onto another one (and no crafting is possible) the item positions get swapped.
On the other hand, it is perfectly resonable for a container, to not contain itself.
While we cannot move a container into itself directly, using the swap-mechanic the reference to the container gets destroyed.