Moving diagonally around a crater is sometimes not allowed

[1j01]

On a plane, left, up is equivalent to up, left but not so in a 3D voxel world.
With 3D rotations, order matters, like with a Rubik's cube.
Consider the case where a pawn wants to attack a piece to its diagonal, and there's a voxel crater adjacent to them.
left, up may attack the piece whereas up, left may go down into the crater, and not come out.

Deranged (order-swapped) diagonal moves are needed.

But what about bishops/queens? Unlike a king/pawn, they have repeated diagonal movement. Should it branch out recursively with either possible interpretation of the diagonal at each step? Bishops/queens are already crazy / overpowered on a voxel world.
So I'd actually favor limiting diagonal movement, perhaps to the plane.

(Is there any logical, intuitive, generally reasonable subset of 3D diagonal moves that allows more than just planar movement? Like, allowed over edges but not around corners? How would that be defined? Or, going over an edge is considered a diagonal in itself (but also straight, so that straight-moving pieces can go over edges)?)