Vines can generate floating in midair in jungles, swamps, and mangrove swamps. I think this was previously part of MC-610 before it was fixed.

1.17 seed and coords:
247 113 3
5082304168952573072
Swamp example
-560 63 -978
-30179096521967669
Note that you must fly to these coordinates, as teleporting will not work.
Also note that reproduction is not always consistent. If these vines don't appear for you, keep looking throughout the nearby jungle.