Is it just the thrifting store? Haven't really seen any recent bugs related to that on this, but poked around on the bug forum to find a old bug about it )still seems to happen for some). Thought it was centered around just about ALL lots disappearing than just one. More than likely your save if any new saves aren't doing it, which there's a chance it could be corrupt. Not sure if this will help ya. Might flip through a few pages of just a few peeps managing to fix their problem. Most seem to roll back to a previous save and it worked for them. One person changed their save 0 to the default to help with fixing theirs. Best not to save your game if you have multiple to all lots doing this.
https://answers.ea.com/t5/Bug-Reports/OPEN-Houses-Lots-disappear/td-p/4620279