Inside Unreal: Animating with the Control Rig Sample Project

I am trying to find the breaking point to when a saved control rig blueprint can no longer reload a fullbodyik node. It seems to be once you use the control rig in an animation blueprint -> control rig node, the control rig fullbodyik will no be able to reload next time you open the project. The fullbodyik node in the control rig blueprint is fine until then.