LODs rendering / overdrawing one Y-level too high?

At the point where vanilla render distance ends and DH LODs begin, I'm getting some ghosting where I can see the LODs rendering one block higher than the actual blocks. Enclosing some screenshots for reference.

Not sure if this is an issue with the LOD rendering, or just with Overdraw Prevention (I can't find the setting to adjust that where the FAQ says it is supposed to be). Or if this is even intended behavior. If it is intended, is there any way to override this and render the LODs on the same Y-level as vanilla?

This is on MC v1.21.5 with DH v2.3.4-b. I'm not using shaders, nor any mods listed under the known incompatibilities. Single player. Vanilla terrain gen – happens with default and large biomes. Haven't tested other options.

EDIT: OK, I did find the Overdraw Prevention settings and messed with them a bit. Nothing alleviated this issue. I tried 0.0, 0.01, 0.10, 0.90, and 1.0, and the issue persisted each time. Also, it happens even on the Extreme quality preset. I haven't messed with the advanced options much, but I did look through trying to identify any setting that seemed relevant and nothing really jumped out
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