This issue has been around since ~0.15, but until recently I had no way to reproduce this in vanilla.
From a server, sending a TextPacket with the Translation type, containing the characters "%0" will cause any clients receiving it to freeze and ultimately crash.
This is now reproducible in vanilla by typing, for example, /me %0 or /say %0.
Expected result
Client should simply output "%0" or ignore the message
Actual result
Client freezes
Tested on MCPE 1.1.0.8 and MCW10 1.0.7.0 in both singleplayer and on servers.
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