Switching a shape to Spawn Voxels upon Collision freezes

[chaoticflux]

Testing sending a 'Birth Shape' (just a simple box in this case) to collide with a wall and turn into voxels to then use the grain solver. I send the 'Collision'  to a new event where I have 'Spawn (shape voxels)'  set to "voxels Inside Shape". For one frame I see the voxels get created, but then it freezes my max.

Unless there's another way to have shapes/objects turn into voxels filling a shape to use the grain solver ...

using Max 2018 to test

thanks!