References for a return node do not appear to update when changing the class settings for the "Create widget" node

References for a return node do not appear to update when changing the class settings for the "Create widget" node. The return node does not appear to update the expected out put and instead throws an error.

1. Open the editor
2. Create 2 new widget blueprints (test1 and test2)
3. Create a function to add the widget (test1) to the viewport (see attached image)
4. Set the function up so that the return node has a reference to the widget being added
5. Compile
6. Change the widget from the drop down to test2
7. Compile
8. Notice that an error is thrown (see image)

Expected: The expected return value would be updated when the widget is swapped out
Result: The return node does not appear to update the expected out put and instead throws an error.

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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