Originally, the anomaly was found by BedBreaker43 (Andrew Regen) after he explored an empty town on a server (most likely ghost of it). After exploring the surroundings he entered the buildings and became trapped in something resembling the overworld, but closed in on itself. Later, he escaped the anomaly.
Four years later the anomaly was reported again by someone named KassandraRossenberg666 on the Minecraft Creepypasta Wiki. The author wrote: "I walked, walked, had already passed about a kilometer, nothing." They also mentioned someone named "ArgatN2" and "ArgatN1," and claimed they "realized that it was a simulation." It is currently unknown what the writer meant, and they may have exaggerated parts of their story, since we have no proof for anything besides screenshots—screenshots that closely resemble the events described in Andrew’s video.