Chaos Destruction: How is "Size Specific Data" supposed to be used?

I wanted to set up my geometry collection so that larger chunks used levelset collision while smaller chunks used analytic. I thought the Size Specific Data would be a way to accomplish this but for the life of me I can’t figure out how it is supposed to be used.

Setting the primary collision to particle-implicit with level set, and then adding a Size Specific Data index with a max size of 100 and collision type of implicit-implicit sphere, results in no collision at all (mesh falls straight through the world AND the kill field!)

Is this feature unimplemented or am I just not understanding how it works?

Edit: Just to clarify, I’m using UE5