Top/bottom textures of glass panes are mapped incorrectly

The bug

The edge texture is mapped onto the top and bottom of glass panes in such a way that it "repeats" within the same block space, which is unexpected.

How to reproduce

Compare the texture on the top of a glass pane to the texture on the side (when connected to a block you can see through). The top should match the side, but does not.

How to fix

The resource pack attached to MC-267315 fixes this issue entirely.