This is a workaround for FabricMC/fabric#66. Otherwise, all sorts of bad things happen to worlds loaded in a dev environment. It would be good to somehow patch that bug, so that we don't have to replicate vanilla tag content in our own tags.

FabricMC/fabric#66 has been fixed, so this issue can be resolved easily by removing the duplicated content.

Resolved in 1.18.2 without me even noticing this, assuming it wasn't resolved already. All our tags are datagen now and use the default replace value.