I removed all mods and custom content, started a new save file, moved my household into copperdale, and visited the bubble tea store. When at the store, vendor does not spawn. When trying to interact...
Ideas
I've had this same issue, playing on Console. PS5 specifically. Nothing seems to change it from appearing, even when arriving on the days in which the events occur. Providing a save may also help! I'm unsure how to attach one, but I'm sure one of the staff could help :o
Edit: after checking the compiled list of bugs, it seems this is already under investigation, so it should be resolved soon!