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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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:
[22:00:49] [Client thread/ERROR]: Couldn't render entity
java.lang.ClassCastException: java.util.Optional cannot be cast to java.lang.Boolean
at ajs.dA(SourceFile:140) ~[18w07b.jar:?]
at cgw.a(SourceFile:24) ~[18w07b.jar:?]
at cpo.a(SourceFile:142) [18w07b.jar:?]
at cpt.a(SourceFile:41) [18w07b.jar:?]
at cpt.a(SourceFile:16) [18w07b.jar:?]
at cot.a(SourceFile:368) [18w07b.jar:?]
at cot.a(SourceFile:355) [18w07b.jar:?]
at ckj.a(SourceFile:612) [18w07b.jar:?]
at ckd.b(SourceFile:1175) [18w07b.jar:?]
at ckd.a(SourceFile:1083) [18w07b.jar:?]
at ckd.a(SourceFile:944) [18w07b.jar:?]
at bxe.b(SourceFile:820) [18w07b.jar:?]
at bxe.a(SourceFile:381) [18w07b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:141) [18w07b.jar:?]

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.