Cave Culling not working on multiplayer

This feels like x-ray/xray. Even though I'm not going to chase down individual diamond veins, I could imagine seeing an ancient city which would be hard to ignore, for instance, since the sides of the LOD chunks are rendering down to bedrock.
1.21.4 (multiplayer) server with 2.3.0-b
Quality: Extreme, CPU Aggressive, Overdraw 0.0, Cave Culling True, Cave Culling Height 60, Enable Beacon Distance Culling True, Disable Frustum Culling False, Disable Shadow Pass Frustum Culling False.
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