For a comprehensive list of other examples of issues with 2D planes in models not being mirrored as expected, click here.
The planes composing vines do not mirror on the back as one would expect, resulting in physical/illogical weirdness.
Fixed model (Mojang has full permission to use this fix): vine.json
This issue did not exist up when vines were introduced, and was introduced with the fixing of
MC-48512 in 14w10a.
- Place a vine on a sufficiently visually transparent block or hanging
- View the jutting out pixels on the bottom right of the vine texture
- View the exact same section of the vine on the direct opposite side
- Note that the exact texture pattern at that position is different, even though it should be the same