Low PSI in airport parking lot

I parked my 1 month old 2025 ModelY in long term airport parking Thursday night, and late yesterday I got a notice that my rear passenger tire was at 23 PSI. It’s in the NW and temps are in the low 30’s.

Has this happened to anyone before? If I get back Tuesday and I have a flat, how do I get someone to service it in airport parking?

What I’m wondering, is if I had a leak when I parked, why wouldn’t I get a notice the next day that my pressure was low? The psi hasn’t dropped below 23 since last night. Could it be a faulty sensor?