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When entering any command using ~'s the game will become unresponsive. I have tried pressing every button and combinations of buttons (Ctrl + a, delete). I have also tried clicking on the suggestions and that also does nothing. Entities in the game are still able to move and make noise while this is happening. The only way to get out of chat is to close the application.
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Cannot reproduce in 1.13-pre2, even when using the same command shown in the screenshot.

Duplicate of MC-123968. This is caused by the discord overlay.