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

Here are the docs: https://docs.papermc.io/paper/misc/paper-bug-fixes#duplication-bugs (allow-unsafe-end-portal-teleportation)

Ensure you uninstall GravityControl before enabling the Paper option. If you don't, gravity blocks will be duplicated twice.

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GravityControl

Liberate your server from the anti-dupe bourgeoisie.

Paper plugin to enable gravity/sand duplication

Discord

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