Ant gardens biome has no translation.

I also think it needs to be registered to minecraft:is_overworld, minecraft:stronghold_biased_to biome tags or other appropriate forge:*/c:* namespace biome tag.

Fixed the translation issue in 1.0.3, Tags will be likely fixed in another bugfix update if it occurs, if it doesn't it will be for next version

Playing with Seed: [-7187558798595102158] with default setting of uncharted-expeditions and Ant Gardens not found anywhere. Traveled over 10000 in all directions and compass says not found!
Forge version: 1.0.4.2
https://www.curseforge.com/minecraft/modpacks/uncharted-expeditions