PCG Spawn Actor Node turns Red

What does it mean when a Spawn Actor node is red instead of green in a PCG graph? I’m having an issue with spawning and I wonder if this is an indication of the problem. I’m not getting an error message.

SpawnActor

Did you ever figure this out? I am having an issue with actors spawned by red nodes are in the packaged build, but the green actors are missing when using PCG stamps. What does the colours mean?