if you on paper least build 1.20.6 you can disable end safe teleport in paper-config-global and remove this plugin

This is not 1:1 fix you need server patching

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allows players to using gravity block duplication glitch again

How is work?

Whenever a falling sand entity comes close to or hits the end portal, a new falling sand entity is summoned with a velocity that shoots it straight into the portal. However, we encountered a problem when the entity got reset by the safe teleport Paper patch - it lose its velocity. To fix this, we added the velocity back when the entity was in the end.