Both cars unlocked and presumably started at different times for different people, so it would have had to have been simultaneous of two identical race conditions on two different sets of devices at different times. This feels like total bs.
No, I am suggesting one race at the factory that gave the two vehicles the same private key. Therefore Person A can always access Person B's car and vice versa because they use identical keys.
Yeah, now that I "said it out loud" it seems like if that were the case, there would be instances of them using the app while you are driving or near your car. You would know "something" is wrong with your car even if you don't know what exactly.