when the melon grows and the stem direction changes, the observer doesn't detect it.
MCPE-48737
observer not detecting melon stem facing melon
Resolved
Duplicate
0
I do believe this is intended behaviour for bedrock edition on Minecraft. Check this link out and it will tell you all about what the observer can and can not detect. It shows that bedrock edition observers will not detect changes from the stem. https://minecraft.gamepedia.com/Observer