Ideas
There is a thread for the retail/vet workers being a problem for owned businesses: https://answers.ea.com/t5/Bug-Reports/OPEN-CD-GTW-Retail-worker-vets-don-t-spawn-for-owned-business-as/m-p/13311323
Yours does seem to behave the same although it's not owned.
What exactly do you mean by general community lots ?
That was me who created that thread all that time ago, and I'm back to say I'm still having all these same problems in my game over a year later.
I am honestly just defeated at this point, how can they release an entire EP about businesses when the existing businesses are completely broken. It's a real shame because the new EP is exactly what I'm looking for in my game, but with For Rent corrupting saves and existing businesses not working I LITERALLY cannot play my game, as so much of my gameplay is centred around businesses.