height-limit issues
MC-70010Double plants can be placed at and grow at y = 255 resulting in incomplete double plant
Fixed
MC-107343Wooden trapdoors at y=255 cannot be opened by hand
Duplicate
MC-117805Oak trees can generate right below height limit (y = 256) resulting in incomplete tree
Fixed
MC-117806Dispenser with filled bucket at y = 255 facing upwards replaces filled with empty bucket despite no fluid being placed
Fixed
MC-142300Attempting to place a door or 2-block plant one block below the height limit will not give an error message, despite still failing
Confirmed
MCPE-43650Players falling through blocks at y=254 and above
Fixed
MC-159237Velocity Reset Error at World Height Causes Infinite Elytra Flight
Duplicate
MC-162116Getting out of water at the height limit causes you to jump higher
Duplicate
MC-184430A structure block gives no warning when the structure would cut off outside the height limit
Community Consensus
MC-184432There is no warning when plants are bonemealed, but cannot grow above or below world height limits
Confirmed
MC-184433When applying bone meal to grass / ferns / nether fungi at the upper build limit, there is no warning, and the taller part of the plant is cut off
Community Consensus
MCPE-119529Specific world the height isn't 320 height limit when Caves & Cliffs feature is turned on
Invalid
MCPE-151150instead of 12550821, -64, 12550821 i am at 12550821, -inf, 12550821
Incomplete
MC-264777The game crashes during world creation if noise settings height range is outside the dimension height range
Important 
