Blueprint: Referring to an actor in a streaming level, can't save level?

Development World Creation
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  • Open Level Blueprint for the persistent level.
  • Select an actor in a streaming level.
  • Right-click the graph, Create a Reference to…

Can’t save the persistent level.

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I see in V1.8.0 I even cannot create this reference.

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The actor in the shared streaming level is an ExponentialHeightFog. It is shared so I don’t really want to remove it, but adding another ExponentialHeightFog could be also problematic: How do I use more than one Exponential Height Fog? - Rendering - Unreal Engine Forums