I found an Earth Minecraft server that is doing a full reset and switching to a 1:500 scale Earth world.
The owner spent hours downloading the world files and extracting them then re zipping them and importing everything into their server host.
After that they ran Chunky for a long time and it was still not finished. When they refreshed their Bluemap they saw big stripes that look like corrupted areas. If you teleport into those spots they turn into normal Minecraft biomes instead of the Earth terrain.
This server feels like a big world project where they are trying to fix the map and salvage what they can after a rough import.