No Collision With Occlusion?

[Meoco]

Hello everyone!

I am attempting to revive an old mod that I abandoned development on many years ago and have run into an issue. When setting the BlockBehaviour Properties whilst initializing my custom block, I haven't found a way to turn of physical collision but keep occlusion (the "noCollission" method turns off collision and occlusion for some reason). For reference, this is a block that is using a semitransparent texture and is intended to be a block of concentrated darkness. It is a full block with a normal model, but because it is darkness, it is intended to block light. I tried extending the Properties class to make my own method to no avail, is there something I'm missing?

Screenshot showing light getting through:

Spoiler

tl;dr;

How do I disable collision but keep occlusion for a block?