External inventory changes except for the hotbar are not registered in a creative mode item selection screen

Low gravity causes entities to float mid-air and forces OnGround to be false

Item desync / duplication when dropping items in creative mode

Markers and display entities obstruct placement of armor stands and end crystals

/return run function in combination with a fork and a function that doesn't return has inconsistent behavior

A function with /return fail run in chat doesn't indicate failure

/random roll|value only support ranges up to 2^31-2

/data produces a positive result for low negative numbers