when you right clicking weeping vines with any block, the block will replace it, and if you right clicked it with weeping vines in your hand, it has the same texture as if It was one tall vine.
MC-173783
Weeping and twisting vines can replaced by any block
Resolved
Fixed
4
mahmoud saleh
eowyn36
Confirmed
Important
Block states
20w10a, 20w11a
20w12a
Retrieved
I believe the block replacing relates to MC-173160. The long and short vine thing is definitely related.