The Zombie Horse appears invisible upon using said spawn egg and summon. Seams to be a resource issue. Attempted to try a resource pack and the Horse was still invisible. Possibly a model issue?
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The invisible zombie horse that turns into a zombie after relogging has been there from 18w02a to 18w16a. And it actually spawns in a invisible zombie that you can't see until you relog. Any zombie horses you had before entering the snap shoots, would turn it into a invisible zombie you can't see until you relog.
Looks to be similar to the bug that was fixed in 18w02, though I didnt see that when typing in "Zombie Horse Invisible" for anything recent. The log data seems to indicate a rendering issue: