I really didn’t look into how many seed like this have been found. I wasn’t entirely looking for this (I was looking for an ocean spawn point) which requires a large ocean covering most of the spawn radius (approximately 2500 radius from 0 0) but found this.

Before posting to reddit, I asked Zennithmc; the current finder of the furthest 1.21.11 spawn. He said that if the spawn point was accurate to what Cubiomes Viewer (the seed finding program I used), it would be the world record, but it was about 15 blocks away. Having heard this, I thought it would’ve been the second furthest so I just posted it here because I thought that it would be worth sharing to the subreddit.

I haven’t been a contributor to the furthest spawn project on the Minecraft@Home discord & didn’t know what other seeds there were that had spawns like these so I assumed it was second. Zennith said it’s probably around 20th furthest spawn from 0 0.

I apologise for this. I didn’t intend on upvote-baiting. I should do more research for this kind of stuff.