Civ buffs - issues when underground

When digging trenches at my base, I noticed I wasn't always getting the civ buffs (Speed, Haste, Night Vision) even though my base is entirely in Planes land. It seems that at certain locations, the buffs work until I go below a certain Y height. It appears that this may be due to the Dripstone Caves biome under my base. If I am at a higher elevation, I am in "Taiga" and receive buffs. If i am at a lower elevation, i am in "Dripstone Caves" and do NOT receive buffs. For context I am a planes walker