I think I found a bug. Load v0s0r1w30h3l30a8b11c9d9pZw9Z4Z4Z4AZ3AZ3A and take one step. The expected result is a 2x3x2 block, however it is missing two cells in a way that breaks the symmetry of the original figure.
(8,11,9,9 is conway, adapted for simulating warping 2d in warping 3d. This particular example seems to work fine for heights of 1, 2 and 4, the bug occurs with height 3.)
edit: Different example:
glider that stops when warping:
functional counterpart with slightly different length: