in 1.2.5 this feature was in the game but in 1.3 a version which completely broke minecraft broke this feature as well and seems to have been forgotten and not fixed.
here's a great video explaining it: https://www.youtube.com/watch?v=pAJPc71YOnY&t=388s
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ZacIsGoodAtGames
Thank you for your report!
We're tracking this issue as MC-26678, so this ticket is being resolved and linked as a duplicate.
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