The c:is_dense_vegetation/overworld tag should include all overworld biomes that have dense vegatation.

Mangrove swamp has vegetation dense enough to significantly hinder travel through that biome. It is more dense than old growth birch forest and old growth spruce taiga, which are in the tag. So mangrove swamp should be part of the tag as well.

NeoForge issue: neoforged/NeoForge#1055

The c:is_taiga here should be minecraft:is_taiga

Edit nvm on my last point. We have c:is_taiga which pulls from minecraft:is_taiga so it's fine