RelaxationStepLevelSetCorrectionInner doesn't work for 3d multi-resolution

[WeiyiVirtonomy]

The relaxation using RelaxationStepLevelSetCorrectionInner produces weird particle distribution

Lattice:

After relaxation:

Gaps:

RelaxationStepInner doesn't have this problem:

There might be a bug in the 3d level-set shape of this beam