Blocks that use cutout rendering handle translucent pixels differently

Discovered while testing MC-120173.

The bug

Blocks which use "cut-out" rendering will render a transparent texture differently depending on whether the block uses mipmapping or not.

How to reproduce

A resource pack is attached to this ticket that replaces the blockstates files for glass blocks and glass panes with those of tinted glass, a translucent block.

1. Download and apply the attached resource pack

2. Place a minecraft:glass

3. Place a minecraft:glass_pane

4. Observe

Expected results

Both blocks would appear identical.

Actual results

One appears entirely opaque and the other largely transparent.