Items disappear when dropped indoors

I am playing in a world that I started before the [Game Update] - 291461 came out.

when I'm indoors (caves, ruins, shops, etc) if I drop something it just disappears.

also Idk if this is related but clouds like the ones on the outside of the map (see picture) just spawn randomly.

now I'm stuck in that room because I can't weigh the plates with anything.

Edit: I tried making a new world the bug didn't happen there.