Missing video on back to back visitors

I notice that when I have back to back visitors to my door, the 2nd visitor does not trigger video. Normally, that 2nd visitor is one of my parents who live in a granny flat and are picking up a package that was just dropped off. However, this does raise the concern that there is a window of time just after a package is dropped off that a porch pirate can come and steal the package undetected. I looked through settings and didn't see anything related to this behavior. Am I missing something?