Sorry just saw this - I’ve seen this a couple of times when upgrading, and I think it just happens when you paste it all at once and the editor is “not aware” of the macros yet - I can’t remember which way around to do it, but if you paste in the macros first, SAVE them, then paste in the function library and compile it should work? Or it might have been function library first, then macros… one or the other.
Feel free to bump that thread then saying you got it working in a packaged game… no one else has. In that thread, Epic appeared to indicate that it was a huge job to get community plugins working in a BP only packaged project and that their “interim” solution (i.e. the editor compiles for you, meaning it’s still a code project) was staying for the foreseeable future.