Tutorial: OCIO & 3D LUTs - Applying 3D Color Grading LUTs when using OCIO

Hello!
Is it possible to blend between LUTs with this method? I’ve enabled Time Blending on both of my PPVs and adjusted the blend time. I’ve set vignette density to 1 as a sanity check, and that setting seems to blend, but the LUT material seems to be ignored in the volume I’m trying to blend into.