Testing this out on some old Saves from backup. The overlapping seems to be gone, but all the SM Apt dwellers have Festival items in their Household Inventories. Moved brand new Sims into some of the unoccupied apartments. They also had Festival items in their Household Inventories.
Since the world cruft around apt, dorms and r rentals took awhile to show up it's hard to say if it's gone or not. I think the Saves I'm using predate that problem. Will have to play with some newer Saves.
Can you delete them from the household inventory ?
Yes and no. When I added MCCC and used the household inventory delete, there were clearly more items than were visible. (I noticed this because I was monitoring the Save size.) Which seems odd since I had originally (when playing without mods) used the show hidden and live objects cheats.
I think this is why letting the game boot my Sims to HM (instead of moving them out myself) worked to get rid of the Festival items when I uninstalled CL. When I checked to see if they were in HM after uninstalling CL, I was spammed with "item not found" messages. There was a lot of cruft hiding in their inventories.
