When jumping on tilled, irrigated farmland, with crops, players and mobs glitch downward.
To reproduce:
Create a structure.
As roof, place farmland.
Irrigate the farmland.
Under the farmland, there must be air.
Plant a crop.
Jump onto the crop.
Expected result: Player lands on the farmland. Farmland is turned to dirt.
Observed result: Player glitches down through the farmland. Farmland turns to dirt.
Works for sheep too.
Thank you for your report!
We're tracking this issue in MCPE-164677, so this ticket is being resolved and linked as a duplicate.
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