Attempted to build a zombie spawner exp farm in the bedrock beta using a controller on my phone, is there anything i missed, image from a creative mode copy of the world) :
How to Make an Experience Farm in Minecraft: 7 Steps
How to Make an Automatic Mob Farm in Minecraft
SIMPLE 1.19 AUTOMATIC SPAWNER XP FARM TUTORIAL in Minecraft Bedrock (MCPE/Xbox/PS4/Switch/Windows10) - YouTube
How to Build Simplest AFK Zombie XP Farm in Minecraft 1.8 - YouTube