Put the summary of the bug you're having here
What I expected to happen was...:
it would be unplaceable
What actually happened was...:
It placed on the block (any)
Steps to Reproduce:
1. place any solid block(no buttens, levers, repeaters, ect.)
2. place your twisting vine
Hi there!
This looks like a duplicate of MC-174501. This is an intentional feature, and you shouldn't expect it to be patched as a bug. You can suggest a change to this on the feedback website at https://feedback.minecraft.net/hc/en-us.