If a mob (only tried with zombies but I assume all) is teleported to an unloaded chunk, it goes invisible. It is still there and reappears when I relog. Whist invisible, I cannot attack it either.
I further tried giving it the invisibility effect for 3 seconds to see if it would "reboot" its visibility and it did not.
I gave it armor using /replaceitem and that did not render until I relogged.
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After having this in 15w42a:
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) to this ticket.

I added a forced crash report.

I recorded this bug, or something similar, and attached to: https://bugs.mojang.com/browse/MC-65040?focusedCommentId=256305&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-256305