In case you don't know, torchflower is a new flower introduced in the 1.20 minecraft update. It is a plantable flower that grows on farmland.
The flower become invisible when it is fully grown on a farmland.
There are other 2 modded small grass/flower affected by this config that will also become invisible:
One is budding tomato vine (a crop when you plant a tomato seed on a farmland) from farmer's delight
The other one is glimmer reeds (a grass that grow in water ontop of a modded dirt) from blue skies
version: NoCubes-1.20.1-0.5.0-dev-b81a6c5.jar
other mods version:
FarmersDelight-1.20.1-1.2.3.jar
blue_skies-1.20.1-1.3.29.jar
Fix plant height true:

Fix plant height false: