Packed Level Actor error when packing other blueprints

When making Packed Level Actors, what’s the process when the meshes your combining consist of blueprint meshes already?

I have a building with many blueprint window shutters, and I get errors that they were not packed when doing “Packed Level Actor”. I’m assuming it’s because it’s a blueprint within a blueprint? How should I be going about this? I’ll also mention there’s no obvious issues other than the errors.