Falling from on top of a fence onto farmland causes the game to "ghost" dismount you from your horse. You can walk freely, but not interact with the world, until you press shift. You will then be teleported back to your horse as if you had just dismounted.
See a demonstration here: https://www.youtube.com/watch?v=v0pFu9CewRk
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Thank you for your report!
We're tracking this issue in MC-191714, so this ticket is being resolved and linked as a duplicate.
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Can confirm in 20w45a