The Select node will accept both a Parent Class and a Child Class as inputs if the Parent is added first

The Select node will accept both a Parent Class and a Child Class as inputs if the Parent is added first. The node will compile if the Index is set to anything other than Wildcard.

Note that the node will reject the Parent as an input if the Child is connected first. The node will NOT compile if left with an Index of Wildcard.

The user reporting this says the inputs will be disconnected on restarting the editor, but I was not able to reproduce that behavior.

Reproduced in 4.9.0 binary and Main (CL 2676715)

1. Create a new blank project
2. Create a new Actor Blueprint, "ClassA"
3. Create a child of ClassA, "ClassA_Child"
4. Create a new Actor Blueprint, "ClassB"
5. In ClassB, create a variable of type ClassA
6. Create a variable of type ClassAChild
7. Add a Select node
8. Plug the ClassA var into Option 0
9. Plug the ClassAChild var into Option 1
10. Change the Index to Bool
11. Compile

Result:
Successful compile, despite having two different Actor types plugged into the Select node.

Expected:
The Select node either does not compile, or does not accept two different Actor types as inputs.

Fix UE-51650

Status update on UE-21075 and UE-20622?

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