Pink salt caves is not registered in minecraft:is_overworld, minecraft:stronghold_biased_to, minecraft:has_structure/mineshaft, minecraft:has_structure/ruined_portal_standard, and forge:is_cave biome tags.

Fixed in 1.4.2

Curseforge: https://legacy.curseforge.com/minecraft/mc-mods/galosphere/files/all
Modrinth: https://modrinth.com/mod/galosphere/versions