Counterpoint: a welcome mat that says “welcome” or “come on in” can be used to circumvent such requirements.
I think it comes down to whether the limitation of entry comes from a restraint external or internal to the vampire. If there is some force that comes from people/houses that prevents the vampire from entering until consent is given, then I think you may be correct in that the permission goes as interpreted by the permission-giver. If it is a compulsion that comes from the vampire themself that they need to receive permission, then it comes down to the interpretation of permission as received by the vampire, and they would have more leeway to twist meanings to allow themselves entry.
Personally I lean toward the latter understanding as it is a simpler explanation of supernatural phenomena for such compulsions to come from the vampire’s psychology than explain some magical force acting on the vampire from the dwelling. It also makes vampires more sinister and therefore scary, which for a horror entity is good.
It would also fit lore to be the vampire’s OCD that prevents entry, they also have to count things like grains of rice or matchsticks if spilled in front of them before they can continue on.
What about abandoned house, or dilapidated shack with someone in it? Does it need to be the rightful giving permission, or can it be a random person (i.e. can the vampire hire a squatter to let them in)?
No, the permission needs to be granted verbally and explicitly. It cannot be implied in any way.
Counterpoint: a welcome mat that says “welcome” or “come on in” can be used to circumvent such requirements.
I think it comes down to whether the limitation of entry comes from a restraint external or internal to the vampire. If there is some force that comes from people/houses that prevents the vampire from entering until consent is given, then I think you may be correct in that the permission goes as interpreted by the permission-giver. If it is a compulsion that comes from the vampire themself that they need to receive permission, then it comes down to the interpretation of permission as received by the vampire, and they would have more leeway to twist meanings to allow themselves entry.
Personally I lean toward the latter understanding as it is a simpler explanation of supernatural phenomena for such compulsions to come from the vampire’s psychology than explain some magical force acting on the vampire from the dwelling. It also makes vampires more sinister and therefore scary, which for a horror entity is good.
It would also fit lore to be the vampire’s OCD that prevents entry, they also have to count things like grains of rice or matchsticks if spilled in front of them before they can continue on.
I then have a question of my own.
What about abandoned house, or dilapidated shack with someone in it? Does it need to be the rightful giving permission, or can it be a random person (i.e. can the vampire hire a squatter to let them in)?