I was joining a realm and then I cancelled the join and quickly entered a single player world, upon joining I was wearing my gear I have on my realm, the sky was switching between day and night and I was standing in an invisible room to a similar scale of the room I was in on my realm. A quick rejoin fixes most of the problems apart from the time changing rapidly.

In the picture you can see that I am running on wool high up in the air even though I am not standing on anything

Update 1: a second relog fixed the sky bugging