Compilation fails after binding an event to a server-only delegate property in the Blueprint editor.

Attempting to bind a custom event to a server-only delegate property currently fails to validate after compiling a Blueprint.

1. Create a new (blank) C++ project.
2. Add a new C++ class based on Actor (MyActor).
3. In Visual Studio, edit MyActor.h so that it appears as follows:

   #pragma once
   
   #include "CoreMinimal.h"
   #include "GameFramework/Actor.h"
   #include "MyActor.generated.h"
   
   DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FActorSpawnedEvent, AActor*, Spawner);
   
   UCLASS()
   class AMyActor : public AActor
   {
   	GENERATED_BODY()
   	
   public:	
   	// Sets default values for this actor's properties
   	AMyActor();
   
   protected:
   	// Called when the game starts or when spawned
   	virtual void BeginPlay() override;
   
   public:	
   	// Called every frame
   	virtual void Tick(float DeltaTime) override;
   
   	UPROPERTY(BlueprintAssignable, BlueprintAuthorityOnly)
   	FActorSpawnedEvent OnActorSpawned;
   };
   

4. Recompile the editor and reload (or hot reload, either way is fine).
5. Create a new Blueprint class based on MyActor (MyActorBP).
6. In the Blueprint editor, switch to the Event graph.
7. Drag off of the BeginPlay event and select to create a "Bind Event to OnActorSpawned" node.
8. Drag off the Event pin and add a custom event.
9. Compile. Note that an error results "CustomEvent_0 Signature Error: The selected function/event ('CustomEvent_0') is not compatible with this delegate (the delegate is server-only) - try marking the function/event AuthorityOnly." even though the event appears to be server-only due to the icon in the top-right.

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