Yeah, I've had problems with that, too. The short version is that vampires have no sense of self-preservation and just stand around playing on their phones or whatever in direct sunlight until they die.
Instead of reset object, what has worked for me in the past is "cheat needs," since they won't die until their vampire energy drops to 0. Cheat needs, and then immediately travel to rush them inside. I've also spent death flowers on my unfortunate vampire neighbor who lived in Sulani and decided to go wading in direct sunlight.
But generally? They're all suicidal when you're not playing them. ☹️ Get them sun resistance as soon as you can if you play rotationally.