First: when taming a horse they don't buck you off, you can sit there for hours.
Second: When taming the horse never becomes tamed.
Third: After summoning a tamed horse the horse cant move nor jump.
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Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-89924. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.