After relogging, the ground of all interiors has become invalid for dropping things

I played for 16 days, got the 'endless rain' bug (but I doubt, it's related), relogged again today (while standing outside of my home).

Now, in every interior I tried I cannot drop any items on the ground or place any structures. Additionally, the cloud particles effect occurs a lot in the rooms (see images). It seems like the entire ground has become invalid to drop anything. Reloading does not fix the issue.

In both cases, dropping the items on the cursor is not possible.