Horses in water completely break the game

Thank you for your report!
We're actually already tracking this issue in MC-101247, so I resolved and linked this ticket as a duplicate.

However, that ticket has already been resolved as Fixed. The fix is already included in the latest version of the game (1.15.1).

If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.

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