Copying Private Use Area characters into Minecraft chat causes the game to crash.

I tried pasting U+E900 into chat and it caused the game to crash. There isn't much more than that, though I saw this in the latest.log file:

[20:49:11] [Client thread/WARN]: Couldn't find glyph for character ? (\ue900)

It will even crash for resource packs that include font textures for them for some reason (with the same error).