Select Node not supported in AnimGraph, but still remains a selectable option

In the answer provided by the developer for AnswerHub question, "Select Node" is not supported in the AnimGraph. However, the user is still able to select and add this to the AnimGraph which is causing some confusion. (*See attached image.)

1. Open any project that contains an AnimationBlueprint with a State Machine already built.
2. Double click to open a State in the AnimGraph
3. Right click to bring up a selection of nodes to choose from.
4. Choose the "Select" node.
RESULT: This node is not supported in the AnimGraph and thus, should not be a selectable option.

Select node not working in custom blend transition (AnimBP)

Select node not working in custom blend transition (AnimBP)