RaycastParams don't work with Blockcasts?

Not quite sure why but when i attempted to utilize roblox’s blockcasts feature and this is my code:


the raycast params are only for the hitbox object that i add to every character model, and is a whitelist one. The print is as follows:

it is hitting my left arm even though the raycast params dont have it in their whitelist, why is that? and is it an engine bug?