The bug
When you equip a horse with any type of horse armor, the horse becomes invisible.
How to reproduce
Equip a horse with any type of horse armor.
→ ❌ Horse becomes invisible.
Game output
Couldn't render entity
h: Registering texture
at dha.a(SourceFile:76)
at dcm.a(SourceFile:28)
at dcm.a(SourceFile:13)
at dcb.d(SourceFile:90)
at dcy.a(SourceFile:225)
at dcy.a(SourceFile:166)
at ddd.a(SourceFile:41)
at ddd.a(SourceFile:16)
at dca.a(SourceFile:390)
at cpf.a(SourceFile:153)
at cpe.a(SourceFile:62)
at coo.a(SourceFile:79)
at cpe.a(SourceFile:71)
at cxp.a(SourceFile:795)
at cjj.c(SourceFile:817)
at cjj.a(SourceFile:380)
at net.minecraft.client.main.Main.main(SourceFile:144)
Caused by: java.lang.IllegalArgumentException: (65, 0) outside of image bounds (64, 64)
at dgl.a(SourceFile:177)
at dgl.b(SourceFile:253)
at dgs.a(SourceFile:50)
at dha.a(SourceFile:60)
... 16 more
Note from @unknown: If this happens to you, don't attack the horse. It will either make your screen black or another (transparent) color (for example: transparent red happened to @unknown).
Linked issues
is duplicated by
Attachments
Comments
Same thing happened in my game (18w43c). I accidentally attacked an invisible horse while trying to get on another horse (I thought the invisible one had despawned). After I hit it my screen was stuck with a red wash until I exited the entire game.
The red coloring also followed me to another world before I tried exiting the game.
Any type of armor changes them to invisible, but saddles do not.
[media]Update! After I killed an invisible horse and the red wash appeared I killed a nearby cat and the wash went away! I'm going to see if I can do it again.
Update #2: Okay so if you hit an invisible horse and the screen goes red, then you hit a different mob the wash will disappear.
Update #3: If you removed the armor the horse reappears. If you hit the invisible horse and you get the red wash and you take its armor off the red wash stays, but if you then hit it while it is unarmored the red disappears.
White screen from spectral arrow occurs when horse is equipped with armour after being shot with spectral arrow as well.
Jen Ivins, it only lasted until the armor was taken off when I tried it.
link to a video onto the Invisible horse glitch: https://www.youtube.com/watch?v=FYMxP-oPFhU
video evidence of screen turning red on hit: https://www.youtube.com/watch?v=Avyg0-M-DXo
video evidence of screen turning white on spectral arrow hit: https://www.youtube.com/watch?v=CAqehYPEJUg
Screen remains white even when game is paused.
Video Evidence of screen turning black when hit or hit with spectral arrow: https://www.youtube.com/watch?v=W5Njf1PuuZ4&t=1s

My screen turns completely black and then it is impossible to do anything. Game needs to be quit via system (❌ ) then. But I faintly remember a similar bug happening some time back, when making entities invisible and hitting them, the whole screen would flash red, as the code that makes the entity red has nothing to work with and so takes everything into the color change. So this are kind of two bugs.
1: The horse going invisible with armor on.
2: An unrendered (not invisible by potions) entity will make the hit-color-code go over/underflow with the tint.
This issue is still happening in my game. I have no texture-packs on except the default, yet when I place any armor on any breed of horse, said horse disappears and only a shadow remains. The red madness and the transparent screen have not occured as of this post, and I doubt they ever will. Why is the issue status stated as RESOLVED when the issue is STILL HAPPENING?!? Explain that to me will you? There is NO RESOLUTION stated in the above claim, the only thing stated in the area marked RESOLUTION is FIXED. What is this supposed fix? What are we to do too solve this issue? This is not just me asking. Lots of other Minecrafters are experiencing this issue. They either haven't reported it yet, or, they aren't signed up on JIRA/bug tracker. We want an answer to this issue, instead of it just saying FIXED, and not stating any steps to resolve the issue.
I am not wanting you to rush or make a hastily prepared fix. That is one thing professionals don't do. Take your time, get it fixed right, and have a happy Thanksgiving!
Sincerely,
Josiah Guthrie
Gamertag: 1955Chevy
Fix Version/s: Future Version - 1.14+
This bug will be fixed in the next snapshot (which will maybe be released tomorrow).
Ok, thanks for telling me that. I was not made aware of that action until now. If I was rude or pushy in the previous message I'm sorry. I had noticed that no action was being taken to fix the issue. Now I know that the issue will be resolved in the next update. Thanks for letting me know.
Happy Thanksgiving!
Sincerely,
Josiah Guthrie
Shooting the horse with a spectral arrow in 18w43c is not adviced. Screen went white, and screenshots show psychedelic colors, as shown in the attached screenshot.