Hi,
Can someone explain to me why the Enum value is set correctly on the input but return None on the output?
This is because you have stopped the execution on the Set node. The set node is not yet executed and has not yet returned a value.
What you are reading on the input is actually the result of the getter of the Equipment Slot of the Selected Item.
Add one node after the set, move a step and you should be able to see properly the output of the Set node.