Top texture of cactus in pot is missing

Put the summary of the bug you're having here

What I expected to happen was...:
there would be a top texture

What actually happened was...:
there wasnt?

Steps to Reproduce:
1. place a flower pot
2. plant cactus
3. look at the top

4. observe the wonderful blocks on the other side of the cactus, through the void in the center of it

Note: im playing on fast graphic and every detail is at minimum, in case any of that affects the rendering