Free hanging corner vines are not correctly updated when supporting block is broken

The bug

Free hanging corner vines are not correctly updated when the the block the vines above are supported by is removed.

See also Bug Of The Week 1: Vines in 1.12

How to reproduce

Use these commands

/setblock ~1 ~3 ~1 stone
/setblock ~2 ~3 ~2 stone
/fill ~2 ~3 ~1 ~2 ~ ~1 vine south=true,west=true
/setblock ~1 ~3 ~1 air