just happened to me as well, mate. i saved the game while inside the house, when i reload the game the floor is black just like your second picture, everything aside the building is gone. then when i left the house and entered it again then everything is just pitch black.
i tried to use console and teleport next to lightning rod which is outside the house everything is just black just like inside the house and even though it's in the middle of the day unequipping lantern caused charlie to attack.
it's day 46 already and i've made my first meat effigy,,, i'm sooo ready to go venturing to the unknown but...
it's really sad but well, that's why we sign up for beta test.
EDIT i walk around and hear pigs noises which means that i'm actually inside the town and my teleportation is succesful. i look up the map and found that my character's icon doesn't show up.
then i decided to kill myself by force attacking pig guardian and let charlie hit me. i resurrect at meat effigy and everything went back to normal.
EDIT AGAIN i went to my house again an everything just repeats itself. so meat effigy didn't fix it.