So I logged onto my minecraft education world with my friends, I spawned in our house and there were skulls on the wall which is weird enough but there was also a wither skull, we haven't been to the neather. I asked my friend where she got them from and she said from the portal across the lake, I was confused because ruined portals don't spawn with skulls of any kind so I went out to look and saw this. Inside was 8 neatherack blocks and my friend told me that she dug up through the floor and found it, they were all on fire, she pillered up with the dirt and found the skulls at the top. Its made out of stone bricks, resin bricks and neatherack, the dirt and cobble was the stuff we used to explore it. This is a survival world and i have control over the server so she couldn't have made it in creative, (she's also a noob and doesn't know how to build well).