How to make a blockstate update using When Block Added and/or When Neighbor Block Changes procedures

I am making a block that acts like Minecraft's Twisting Vines block, where the top stalk block in a pillar will have a different texture from all the blocks below it, and I have figured out how to make the basic setup for a blockstate, but for some reason my procedure that is supposed to activate when the vine has been added or when a neighbor block changes doesn't seem to be activating. Can anyone tell me how to fix this?