For a comprehensive list of other examples of issues with 2D planes in models not being mirrored as expected, click here.
The planes composing glow lichen 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): glow_lichen.json
- Place a glow lichen on a transparent block
- View a specific flower on the glow lichen
- View the exact same area of the glow lichen the flower was on on the direct opposite side
- Note that the exact texture pattern at that position is different, even though it should be the same