Blueprint Interfaces cannot pass by reference between two blueprints

Pass by reference variables do not work when called from a blueprint interface between two blueprints.

Workaround: Use direct communication to pass by reference between two blueprints.

Steps provided by user [Reproduced Internally]:
1: Create a new interface, create a new function, add a Boolean input parameter, and set Pass-by-reference true.
2: Create a new actor BP, add the interface to this BP.
3: Create the event you created in the interface.
4: Drag the Boolean parameter, and type "set by ref". When the Set Boolean (by Ref) node is created, set the value to True. - (So, whatever Boolean parameter we pass to this function will be set to true.)
5: Compile this BP, and add an instance to the scene.
6: Create an actor based BP (or select if you have any) on your scene.
7: Create a new actor variable, make it public, go back to the scene, and set this variable to the BP you created in Step 2.
8: Create a new Boolean variable, and make it public. Make a call to the interface function, and pass the Boolean parameter to this function.

[UE-23848] Bug Status

Fix UE-51650

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