I went through my settlements in my save, and manually disabled several items pre-beta update that I didn't want, such as the tables and counter in the Red Rocket Truck Stop near Sanctuary. The items all spawned back in after I updated to the beta version, left the cell and came back. Now when I try to click on them, I'm given the message "Picked Non Ref AV Object", and it won't let me disable them. After checking around, a very large number of trash objects display this message (all the piles of trash on the ground, the hedges, and several large plants around that get in the way of building that can't be scrapped.)
Reverting back to the non-beta version, and loading an older save removes the items again.