Summary: Lush Cave Trees Generate In Ocean Biomes In The Recent MCPE Beta. I Found That It Found No Lush Cave After Digging Down To The Bottom of The Lush Cave.

Steps to Reproduce:
Step 1: Load a World in MCPE 1.17.30.23 Beta With Caves N Cliffs Toggle Enabled.
Step 2: Fly Around the World Until You Reach a Ocean Near Land.
Step 3: Locate a Lush Cave Tree.
Step 4: Repeat Until You Find a Lush Cave Tree In The Ocean.

Observed Result: Lush Cave Trees Generate In Ocean Biomes. This Means a False Positive Lush Cave Can Be Found.

Expected Result: Lush Cave Trees Shouldn't Generate In Ocean Biomes.