Flipped textures on down faces

[SuperLlama88888]

Thank you for creating such a useful library!

Sometimes, textures are facing the wrong way. I haven't investigated this issue much, but I suspect it's to do with flat cubes (i.e. 0 size in one axis).

Here is a screenshot of the issue when using model-viewer:

However, in Minecraft (and Blockbench) it looks like this:

Here is the model and texture in above:

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Thanks for your time!

[SuperLlama88888]

This is only an issue on down faces.
Using model-viewer:

In Minecraft: