I have had about 3 horses disappear on me now whilst playing on a realm on the new update.
The first one I attached to a fence post with a lead. I logged off for 5 minutes, and when I repoened my game, the horse, fence post and lead were all gone.
The second and third involved leaving a horse in a boat. Again, when I logged back in, the horse was gone (both times).
Horses also disappear sometimes when they jump into water but this is resolved by logging out and back in again.
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We're tracking this issue in MCPE-51837, so this ticket is being resolved and linked as a duplicate.
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