Temporary Fix for Smart Playlist order bug
I stumbled across a Smart Playlist that was keeping the correct order and discovered why. It was a Smart Playlist that contained 2 other Smart Playlists. The original Smart Playlists didn't keep their order but the new one that combined them did. So I experimented on a few other Smart Playlists by making new Smart Playlists that only contained another Smart Playlist. And it works. I've also been able to keep Live Updating enabled.
Hopefully this will help everyone who reads this get by until Apple fixes this bug, which they seem to reintroduce about once a year.