3D block models not rendering in flower pots

Looks like a resource pack. I've never seen that coconut flower pot.

the point of this report IS that it's a resource pack... they're supposed to change block models, but mushrooms use their default model in flower pots, rather than the custom model. Also, I am certain that this is NOT a broken resource pack. The model for things IN plant pots seems to still be hard-coded.

Flower pots with plants in them are entirely separate models than the plants themselves. You should make custom models for the flower pots with plants in them. Works as intended.

It's a resource pack called Default to 3D. Also, I did not make the resource pack, so I don't know how to make it

This is invalid

See: http://www.9minecraft.net/default-3d-resource-pack/

is making W.I.P models. Its outdated, use 1.16 to look at.