this applies to everything except the full blocks, sure this could be a technical limitation, or fabric issue, or even somehow a create fabric 0.5.1f issue, Either way, this applies to as said prior, everything except full blocks, talking panes, doors, trapdoors, etc

Here's pictures

Create framed: v1.4.6

This is a lighting engine limitation/issue. The game doesn't support partial lighting.

On Curseforge:

On Modrinth:

If at some point in the future partial lighting does become supported by the lighting engine, then these blocks will actually have their purpose, but for now it's just a decorative choice.

i mean i was more thinking of them just, blocking light generally, there's no way the lighting engine is gonna have partial lighting be a thing after all

This is how it was in early builds of the mod, and can even be seen on the mod's homepage on both Modrinth and Curseforge!

While it may look alright in the picture, It looks atrocious in-game and actually playing with it, as it adds shadows that don't make sense being there. While I would personally love it to both function and look good, one cannot be accomplished if the other is true as well.