Similar to MC-146155, but happens in 1.19.4 and 1.20 snapshots.
If I use "space" to press a button to a new screen, and the new screen has a text field, then the space character will be inputed to the text field.
For example:

• In the main screen, using the "space" to press the "singleplayer" button, the space will be initially added to the world search text field, and only those world with a space in its name will be displayed.
• In the server list screen, using the "space" to press the "add a server" button, the space will be initially added to the text field of server name.