I have Minecraft Windows 10 Edition Bedrock with update 1.15.
I have a problem that my pumpkin is not growing despite the command
/ gamerule randomtickspeed 3000 and the observer (observer) does not forward the change to the piston which then breaks down the pumpkin.
Do you have a block of grass where the pumpkin can grow on?
Is there a free field next to the pumpkin plant? Water nearby?
Yes and yes
Yes