Could you try re-building out of visual studio for the version you are using and then packaging in editor? Feel like its a mismatch between the editor and your package. That normally happens with non default objects but object is entirely default.
I have packaged and ran several times since adding that in with no issues, but I tend to re-build binaries and intermediates very often.
Edit I did have netsmoother below the objects that attach to it in the class structure though, I could conceive of a situation where when serializing it gets to that last so the ones attached to it have issues. I re-ordered it and committed.