Mipmapping works strangely for solid-rendered blocks with non-black 0-opacity pixels

The bug

If a block that does not support transparent pixels whatsoever is assigned a texture with pixels that are not black but have 0 opacity, the mipmapped version of that texture will set all of those pixels to black.

How to reproduce

1. Download and apply the attached resource pack
2. Create the following superflat world:

   minecraft:bedrock,2*minecraft:dirt,minecraft:coarse_dirt;minecraft:plains

Expected results

The ground would be solid white everywhere.

Actual results

It becomes pure black when distant enough from the player.