The “Past Lives” star’s ethereal gown came with a couple drawbacks. Greta Lee is facing a hilarious conundrum at the Met Gala. On Monday, the “Russian Doll” star, 41, showed up on the red carpet embodying the evening’s theme of “Sleeping Beauties: Reawakening Fashion” in an enchanting naked dress covered in fluffy white flowers at the New York event. She …