First time trying to tame a horse / donkey on new snapshot. Not sure wheather this is a one-time incident.. So, I walked up to a random donkey and clicked to tame it. After a couple of attempts the hearts showed and I got the message that I had completed an achievement. I went on to check the Achievement tab, and it had been updated.
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Thank you for your report!
However, this issue is a Duplicate of MC-138541.
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