My Porch Floor & Stairs are Missing

Hello! I just logged on after about a week and the porch to my house I'm building is missing the floor and the stairs leading up to it. They were both there when I logged off last, but now they are gone. Does anyone know what I can do to fix it?

I do not have any mods turned on either.

https://preview.redd.it/f91hwe2z1q6h1.png?width=3840&format=png&auto=webp&s=bc81dec21a35fb1123f778bd005a1a30bde4e66a