when enable pbr on complementary, the connection has become strange, with reflections appearing.

minecraft:1.21.1
fabric:0.16.9
shaderpack: complementary(iris)
resourcepack: stay true

+1 its been a bit annoying especially for sand as next to the otherwise rough material it is very obvious.

I can confirm that I am experiencing the same visual bug. It’s most likely occurring because overlays inherent the PBR properties of the block that receives the overlay rather than the parent block.

For example, if I had a grass block that was overlaying a sand block, the grass overlay would have the sand PBR, making it look off. In the case of the first image, the sand overlay is using the stone PBR.

As far as I understand, Continuity does not interact with PBR at all, but perhaps implementing a way for shaders to apply the correct PBR material to the overlay could be worthwhile, if possible.

The alternative fix to this issue would be to use a resource pack that uses its own PBR textures, including for its overlays. However, the built-in PBR of Complementary or any other shader would continue to show this visual bug.