Tropical Fish in lush caves spawn in bubble columns

The Bug

I completed making my Soul Sand Water Elevator for the new lower depths under my base and the Tropical Fish spawned in the bubble columns of my build, building up item entities when it flops out of water.

Reproduce

• Find a Lush Cave
• Make a water elevator with magma or soul sand in the biome
• Wait

Observed Result

Tropical Fish spawned in the bubble columns

Expected Result

Tropical Fish wouldn't spawn in bubble columns