Check your client:
This version sits at the peak of the "Overworld Update" cycle (0.14.x), meaning it includes features that were revolutionary for mobile at the time: Redstone Components: server minecraft 0.14.3
You might wonder: Why not just use a modern server with a 0.14.3 texture pack? Check your client: This version sits at the
was a Pocket Edition release (May 2016, added observers, redstone repeater, witches, minecarts with chests/hoppers). minecarts with chests/hoppers).