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Paper 1.20.4 build 445 and above has built in support for enabling gravity block duplication. If you are able, use this instead of GravityControl. It will work better
Ensure you uninstall GravityControl before enabling the Paper option. If you don't, gravity blocks will be duplicated twice.
GravityControl
Liberate your server from the anti-dupe bourgeoisie.
Paper plugin to enable gravity/sand duplication
Features:
Enable duping for each different block
WorldGuard integration
Enable sand duping on Paper servers
1.18-1.19.2+ compatibility. Use version 1.3.0
for 1.16-1.17 support. No NMS or reflection!
Commands
Command
Description
Permission
/gcr
Reload GravityControl Configuration
gravitycontrol.reload