My Username: c_y Server: Hardcore Factions Detailed Description: While making my new blaze farm, I noticed that the blazes were generating nether portals because my base was made out of obsidian. These portals, for some reason, do not disappear like regular when mined. This is not a ghost block issue, as I have relogged and they were still there, even when missing many blocks from the frame. Even after manually updating every block in the portal, it didn't change.
This happened to me when I was making my base if you can remember ;p Its annoying but just break one block under it then place block in the 1 block hole you just created then just keep placing blocks in the holes until its gone Although you might want to move base, as it might create portals now.