When using Rethinking Voxels, things that rendered using Flywheel cannot cast shadows, can this possibly be fixed?

Without Flywheel compat(disable flywheel backend) its normal.

Using mods/shaderpacks:
-Create 0.5.1.h
-Embeddium 0.3.31
-Oculus 1.7.0
-Oculus Flywheel Compat 1.1.3
-rethinking-voxels_r0.1-beta5
(should be reproducible on most other versions)