"A Balanced Diet" advancement

I was loading in my personal world with the snapshot: 21w05a, and I was checking in my advancements. It was #/40, and It was usually #/39. So I loaded up a separate world and ate a glow berry in creative mode and the advancement went to 1/40. The problem is that Lush Caves and glow berries don't generate naturally so I can't complete the advancement. ;~;