voxel-mesher
                                
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                        Face culling for custom block models
Cull adjacent faces (if allowed by the model, as specified in block-models cullFace: true) on custom blocks (2nd shader) if needed. This will reduce the number of vertices and might fix:

(using water and lava from https://github.com/deathcap/voxel-fluid/commit/30a4456f4b4050b85249c332616d7521b35631e7)
This is a bug in the mesher. It should eliminate/merge those facets.