Spellbound Caves preloaded in 1.17.1 (for 1.9+ speedruns). Nether is not preloaded.

How I made it: -Took my Spellbound Caves for 1.8.9 map and loaded it in 1.12.2 -Immediately went to spectator mode, flew around to load all the chests (not nether) -Saved map, then loaded it in 1.17.1 -Immediately went to spectator mode, flew around in 13rd to all the corners of the map to preload all chunks -Went back to spawn, toggled to peaceful, then back to easy while still in spectator mode. -Saved map, then replaced level.dat with original one from unmodified Spellbound on SH website Note: Did NOT use OldWorldFix. Potions and all chests seem fine.