Voxelization Pass and copy alpha pass not really used?

[xiaoyaoing]

Hello,I have some questions about vxgi.
Since in light injection pass，alpha in u_voxel_radiance image will be calcuted.What is the meaning of Voxelization Pass and copy alpha pass?"Is it possible that the alpha information might be incorrect simply because the pass for injecting light at different levels is not executed every frame? However, since the alpha of all voxelized voxels is 1, it seems that the effect of copying the alpha pass is not significant. Looking forward to your reply~"