AO + Shading Interaction with Forge Shaders

This isn't a bug about shaders themselves, but something I noticed hen loading with shaders. I'm on Build 2.0.0-a 1.20., using Forge 47.1.43, Optifine 1.20.1_HD_U_I6_pre6.

When loading with shaders on, DH chunks load and are visual, but have no shading at all. When turning shaders off at this point, the terrain is still there but without AO or shading.

Explaining the images:
1) Loading into level with shaders off DH chunks visible normally
2) Turning on shaders, DH chunks not rendered
3) Loading in level with shaders on, DH chunks visible but without AO or Shading
4) Turning off shaders, DH chunks visible but still without AO or Shading

Not sure if this is DH related, or related to a shader issue not supported by DH, but figured it was worth mentioning.
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