It is possible to create floating twisting and weeping vines

The bug

It is possible to create twisting and weeping vines which are floating / have no support block.

Reproduction steps (lava)

If you quickly put vines in lava, then they will begin to float above it.
Might require rebinding the use block action to a keyboard key and then holding down that key.

See 2020-08-12 17-48-12.mp4

Reproductions steps (pistons)

Pushing with two pistons at the same time:

• the supporting block of the vine
• and the second vine block
  will result in floating twisting or weeping vines.

See video "The Comeback" by _MethodZz_