How to leverage the Anchor Point Group Postion node for FEM

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I'm having some problems understanding the parameters for the `Anchor: Object Point Group Position` node and was hoping I might find some clarification here.

On the constraint type parameter, there are option for Free to move in any direction, Constrained to Plane, Constrained to Line, and Constrained to Point. However, no matter what I have these parameters set to, I get the same result (a completely fixed constraint) even when it's set to Free to move in any direction. Am I missing something to enable these different constraint types? Or could this be something that isn't supported by the FEM solver?

My node setup and parameters for refrence:

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