@cherche - Still seems to be bugged. Can't move a pixpet or egg onto the couch from the Pixpet menu; being already in the room or not doesn't appear to matter.

Using my house as a test, moved the Krash to Entrance, C-1 then tried to move onto Blue Couch (Entrance, B-4), no dice. Removed the Loppani from the house, attempted to place onto Blue Couch (Entrance, B-4), same error. Moved Pydeer egg to 2nd Floor, B-5, refreshed my browser, then attempted to move onto White Couch, B-1 - same error. Returned pixpets/eggs to original positions via the Housing Decorator.