new custom sized nether portals are not the same size

custom sized nether portals, when created did not make a portal on the same size on the other side.

e.g. a 3x3 gate (internal dimensions) created in the overworld will create a 2x3 gate in the nether.

Shouldn't this be a 3x3 gate in the nether? Gates are being generated, but I would think that an identical gate would be generated on the other side.