Sunflowers seem to be missing a part of their textures

I noticed that the back of the sunflower seems to be missing a part of its texture, before you could not see that clearly the yellow part of the flower from the back but now you can't.

Steps to reproduce:

1. Get a Sunflower and place it on the ground
2. Look at the back of the flower

Observed results:
The Sunflower back texture is missing

Expected results:
The Sunflower back texture is present

Analysis by KejuGorenk:
If you open terrain_texture.json and then search for sunflower_additional, you will notice that only textures/blocks/double_plant_sunflower_front texture is present on the textures list, while the back texture is missing and causing this issue, to fix this simply add the textures/blocks/double_plant_sunflower_back to the textures list.