The realculate face normals step of the fix poles option in the voxel
remesher is currently the slowert part of the entire operator (it
usually takes more than the voxelization and remeshing in high poly
meshes).
Now the operation runs after edgenet (which is the one that is the one
creating faces with incorrect normals) only on faces tagged by edgenet.
On my tests, this reduces the time of recalculating normals for an
output of 265K vertices from 0.25s to 0.1s