I accidentally wrote a negative value on that modifier and it crashed, I reproduced the steps with the modifier disabled on viewport and I realized that any value below 0.0001 mm, including negatives, go to the minimum of 0.0001 mm voxel size. This could still happen with a logaritmic slider (I never use the slider), there might be a better "fool proof" way of implementing this. Ideally I would love an advanced configuration option, where I could set default, minimum or maximum values for modifiers, that would be very useful.