@endlessfix - you may well be right that it’s only the Export Selected that’s partly broken. I would hope it gets fixed soon, anyway, whatever the details of the bug because it’s a nasty one.
Not sure in the light of that post whether the same bug exists in Shop.
And I think I also remember that if you have any flipped or mirrored components in your model, they won’t print. You have to explode them and re-group, or make them into a unique component.