As the title states, in this new snapshot version, 19w39a, horses are either somewhat or very transparent, this could be caused by the particle fix this new snapshot was shipped with.
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Thank you for your report!
We're actually already tracking this issue in MC-161495, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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whoops, sorry for that double duplicate there.