A simple and configurable one-mixin mod that makes all (even datapacks and modded) structures more spread out (or more common!), essentially making them rarer/easier to find. Useful in big modpacks with a lot of structures mod to encourage exploration and make the experience more challenging or balanced.
When adding the mod to the server (Aternos) an error message show up explaining that sparse structure needs Minecraft 1.21 to work