The bug

The newly implemented glow effect present on redstone torches, despite being three pixels wide, is decided entirely by the colour of a single pixel. Not only does this violate pixel consistency, it also inhibits what texture pack creators can do with this model, and is unintuitive.

How to reproduce

A resource pack is attached to this ticket which changes the top-left pixel of the torch texture to yellow.

1. Download and apply the attached resource pack
2. Look at a redstone torch in the world, or its products

Expected results

The glow around the redstone torch would still be red.

Actual results

It is completely yellow.

How to fix

A resource pack that fixes this issue entirely is attached to this ticket.

Instead of using the top left of the redstone torch for the glow color, it introduces a brand new, dedicated "redstone_torch_glow.png" texture file used for this purpose. This texture file is used for redstone torches, repeaters and comparators.

Visually, the outcome is completely identical to the new vanilla redstone torches, but there are no longer any secretly stretched pixels that texture pack creators will have to contend with when creating custom textures.

Mojang have my full permission (and encouragement) to use these attached resources (or derivatives thereof) to fix this issue.