In all versions of the game from 1.7 to 1.17, once you enter the game and press Shift + Space, the game will not be able to use most of the keyboard keys (e.g., W S A D Space T/Q E), only F1~F12 and ESC will work, and the mouse will work as well. This bug can be fixed by restarting the game, or by pressing Shift + Space again in the game, the game will return to normal
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In that case, please provide some screenshots or videos of this issue occurring whilst the F3 debug screen is enabled.
@Avoma I've found the root of the problem. Shift + space is a shortcut for the input method to switch between full and half corners, and Minecraft only works when it detects English characters in half corners. This problem can be considered closed
Would MC-122421 happen to describe your issue?
Does this issue occur outside of Minecraft?