When mounting a horse near a water source, the horse loses its typical land-based behavior. It cannot be tamed, and it won't throw you off its back. If this is a planned feature, I can't find any information about it. but I think it's a bug
MC-300221
You can't tame horse when is near water
Resolved
Duplicate
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We are tracking this issue in MC-185907, so this ticket is being resolved and linked as a duplicate.
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