Engine: True-color Voxels (KV6) are not affected by Polymost tints.
It appears that KV6 voxels aren't tinted properly when given a pal that has a polymost tint. Models and true-color textures seem fine.
Here's how you define KV6s, if you need it for testing:
definemodel "voxels/pickups/4991_bon1a.kv6" 1.0 0
definemodelframe 0 4991 4991