Early in my Ultimate singleplayer survival world, I made a Nether pumping station for power right after generators. One time I went to check it out, and half of my little stone brick hut was decimated. I couldn't even imagine what could have caused this, so I spawned everything back in and replaced it. Just a bit ago, I went to check it again and the same thing happened. My structure is a complete stone brick prism, with corners filled in so a ghast couldn't have caused this. All I have in my little home is a Linking Book to the Overworld, a World Anchor, a crafting table, and an Ender Tank. The pump itself is about 20 blocks away and it's fine, so the pump isn't the problem. What could cause an explosion intense enough to destroy a stone brick structure and a world anchor?