In 1.4.3 The Feature Where One Cannot Go Down The Void Was Introduced, However One Can Descend Down It By Flying Down The Void. Also, If One Is To Fall Into The Void And They Don't Have An Ability To Fly, They Will Get Stuck Forever As Jumping And Pillaring Is Not Possible.
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Related to MC-1647
I suggest typing in more standard English as capitalization of each word makes it very hard to read. Plus your shift button will get much less wear.