Editor crash when spawning/cloning a static mesh actor

Setting a FActorSpawnParameters' variable's Template to "this" and then spawning an instance of the static mesh actor using the parameter causes the editor to crash.

1. Open UE4Editor (any project)
2. Add code to project based on StaticMeshActor (MyStaticMesh)
3. Add the following to the header file

virtual void BeginPlay()
{
    static bool bSpawnedClone = false;
    if (!bSpawnedClone)
    {
            bSpawnedClone = true;

            FActorSpawnParameters Params;
            Params.Template = this;
            ACrashActor* Clone = GetWorld()->SpawnActor<ACrashActor>(GetClass(), Params);
    }
}

4. Compile the code
5. Add instance of MyStaticMesh to the level and PIE

Result:
Editor will close immediately

Expected:
A copy of the actor placed in the level is spawned.

Fix UE-51650

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