[Control Rig] "Curve" and "Evalute Curve" Node can‘t set External Curve

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I am learning Control Rig. When I tried to use the nodes, I found that the Curve node and the Evaluate Curve node provide an interface for setting the External Curve,but after setting it, the curve will be empty when compiled.
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I have found that this is because the not Constant curve is not accepted, but does this conflict with the original design? Or am I using it in the wrong way? I hope that the experts who know can give me some advice, thank you!

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I have the same issue. This must be a design flaw. Using 5.4

Bump. Same issue here, is this intended? I’d really like to expose my curves in order to overwrite them per control rig instance

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bump

Same issue, hoping someone can shed some light on it.