When you create a function containing an Add Child Actor Component node, duplicate that function, and then change the Child Actor Class option in the duplicate, the changes are also saved to the original.
Found in 4.10 Preview 4. Reproduced in 4.9.2 binary and Main CL 2752291.
1. Open the editor
2. Create a new Actor blueprint
3. Add a new function
4. Add an Add Child Actor Component node to the function
5. Duplicate the function
6. In the duplicate, click on the Add Child Actor Component node and set a Child Actor Class in the details panel
7. Return to the original function and select the Add Child Actor Component node.
Result: The changes made to the duplicate function are saved to the original.
Expected: Changes made to the duplicate function would not affect the original.
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