Civ 6 Exploits: Duplicate Districts - The Most Absurd Exploit Yet?

Do you enjoy Civ 6 exploits? I got a brand new one for you today, involving duplicate districts in the same city. Civ 6 is a perfectly balanced game after all. Big thanks to PotatoMcWhiskey for bringing this to my attention. Know any other fun Civilization 6 tricks? How would you use this? Let me know in the comments!