When riding a horse with shield, you'll automatically block frontal attacks with shield. In previous updates however, the shield doesn't take as much space in the screen. But now, it takes over half of the screen and horse + shield becomes unplayable.
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We're tracking this issue in MCPE-116736, so this ticket is being resolved and linked as a duplicate.
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It's True, When Riding A Horse, You Can Automatically Block Any Frontal Attack, But The Screen Will Block The Gameplay. But In Beta 1.17.10.20, This Bug Has Been Fixed.