Iron bars and glass panes have incorrectly mapped top and bottom textures, causing undesirable rotational symmetry

Relates to MCPE-170440.

The bug

Iron bars and glass panes look rotationally symmetric (excluding the center 2x2 region) when viewed from above.

Java Edition uses two different "side" connection models for iron bars and glass panes, which differ from each other solely in their top texture mapping, which is done to circumvent this problem, so I consider this behaviour in Bedrock Edition to be a bug.

How to reproduce

1. Place two solid blocks with an air gap between them
2. Place iron bars or a glass pane in this gap

Expected results

The top texture wouldn't appear almost rotationally symmetric.

Actual results

It does.