/summon horse -239.64 65.13 210.85 {Rotation:[90f,0f],NoAI:true}
The horse will show up rotated to a different amount, although It says it's 90 degrees when queried via a /data command.
I have seen this (with armor stands) eventually resolve itself after 15-60 seconds or so.
kcrca
Thank you for your report!
We're tracking this issue in MC-272577, so this ticket is being resolved and linked as a duplicate.
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