08:25:35.857  INFO   wezterm_gui::termwindow::keyevent     > key_event RawKeyEvent { key: Physical(LeftControl), modifiers: CTRL, phys_code: Some(LeftControl), raw_code: 37, repeat_count: 1, key_is_down: true, handled: Handled(false) }
08:25:35.857  INFO   wezterm_gui::termwindow::keyevent     > key_event KeyEvent { key: Control, modifiers: CTRL, repeat_count: 1, key_is_down: true, raw: Some(RawKeyEvent { key: Physical(LeftControl), modifiers: CTRL, phys_code: Some(LeftControl), raw_code: 37, repeat_count: 1, key_is_down: true, handled: Handled(false) }) }
08:25:35.857  INFO   wezterm_gui::termwindow::keyevent     > send to pane DOWN key=Control mods=CTRL
08:25:35.913  INFO   wezterm_gui::termwindow::keyevent     > key_event RawKeyEvent { key: Physical(LeftShift), modifiers: SHIFT | CTRL, phys_code: Some(LeftShift), raw_code: 50, repeat_count: 1, key_is_down: true, handled: Handled(false) }
08:25:35.913  INFO   wezterm_gui::termwindow::keyevent     > key_event KeyEvent { key: Shift, modifiers: SHIFT | CTRL, repeat_count: 1, key_is_down: true, raw: Some(RawKeyEvent { key: Physical(LeftShift), modifiers: SHIFT | CTRL, phys_code: Some(LeftShift), raw_code: 50, repeat_count: 1, key_is_down: true, handled: Handled(false) }) }
08:25:35.913  INFO   wezterm_gui::termwindow::keyevent     > send to pane DOWN key=Shift mods=SHIFT | CTRL
08:25:36.107  INFO   wezterm_gui::termwindow::keyevent     > key_event RawKeyEvent { key: Physical(Space), modifiers: SHIFT | CTRL, phys_code: Some(Space), raw_code: 65, repeat_count: 1, key_is_down: true, handled: Handled(false) }
08:25:36.107  INFO   wezterm_gui::termwindow::keyevent     > key_event KeyEvent { key: Char('@'), modifiers: SHIFT | CTRL, repeat_count: 1, key_is_down: true, raw: Some(RawKeyEvent { key: Physical(Space), modifiers: SHIFT | CTRL, phys_code: Some(Space), raw_code: 65, repeat_count: 1, key_is_down: true, handled: Handled(false) }) }
08:25:36.108  INFO   wezterm_gui::termwindow::keyevent     > send to pane DOWN key=Char('@') mods=SHIFT | CTRL
08:25:36.108  INFO   wezterm_term::terminalstate::keyboard > key_down: sending "\0", Char('@') SHIFT | CTRL
08:25:36.114  INFO   wezterm_gui::termwindow               > Ding! (this is the bell) in pane 0
08:25:36.194  INFO   wezterm_gui::termwindow::keyevent     > key_event KeyEvent { key: Char(' '), modifiers: SHIFT | CTRL, repeat_count: 1, key_is_down: false, raw: Some(RawKeyEvent { key: Physical(Space), modifiers: SHIFT | CTRL, phys_code: Some(Space), raw_code: 65, repeat_count: 1, key_is_down: false, handled: Handled(false) }) }
08:25:36.194  INFO   wezterm_gui::termwindow::keyevent     > send to pane UP key=Char(' ') mods=SHIFT | CTRL
08:25:36.272  INFO   wezterm_gui::termwindow::keyevent     > key_event KeyEvent { key: Control, modifiers: SHIFT, repeat_count: 1, key_is_down: false, raw: Some(RawKeyEvent { key: Physical(LeftControl), modifiers: SHIFT, phys_code: Some(LeftControl), raw_code: 37, repeat_count: 1, key_is_down: false, handled: Handled(false) }) }
08:25:36.272  INFO   wezterm_gui::termwindow::keyevent     > send to pane UP key=Control mods=SHIFT
08:25:36.280  INFO   wezterm_gui::termwindow::keyevent     > key_event KeyEvent { key: Shift, modifiers: NONE, repeat_count: 1, key_is_down: false, raw: Some(RawKeyEvent { key: Physical(LeftShift), modifiers: NONE, phys_code: Some(LeftShift), raw_code: 50, repeat_count: 1, key_is_down: false, handled: Handled(false) }) }
08:25:36.280  INFO   wezterm_gui::termwindow::keyevent     > send to pane UP key=Shift mods=NONE
08:25:36.672  INFO   wezterm_gui::termwindow::keyevent     > key_event RawKeyEvent { key: Physical(LeftAlt), modifiers: ALT, phys_code: Some(LeftAlt), raw_code: 64, repeat_count: 1, key_is_down: true, handled: Handled(false) }
08:25:36.673  INFO   wezterm_gui::termwindow::keyevent     > key_event KeyEvent { key: Alt, modifiers: ALT, repeat_count: 1, key_is_down: true, raw: Some(RawKeyEvent { key: Physical(LeftAlt), modifiers: ALT, phys_code: Some(LeftAlt), raw_code: 64, repeat_count: 1, key_is_down: true, handled: Handled(false) }) }
08:25:36.673  INFO   wezterm_gui::termwindow::keyevent     > send to pane DOWN key=Alt mods=ALT
Apparently Ctrl+Space gets "confused" with Ctrl+@.
Changing the key in the binding to phys:Space fixes the problem, but I was asked in chat to file an issue anyway.
To Reproduce
No response
Configuration
local wezterm = require("wezterm")
return {
	hide_tab_bar_if_only_one_tab = true,
	color_scheme = "ayu",
	disable_default_key_bindings = true,
	keys = {
		{ key = "=", mods = "CTRL", action = "IncreaseFontSize" },
		{ key = "-", mods = "CTRL", action = "DecreaseFontSize" },
		{ key = "0", mods = "CTRL", action = "ResetFontSize" },
		{ key = "Enter", mods = "ALT", action = "ToggleFullScreen" },
		{ key = "c", mods = "CTRL|SHIFT", action = wezterm.action({ CopyTo = "Clipboard" }) },
		{ key = "v", mods = "CTRL|SHIFT", action = wezterm.action({ PasteFrom = "Clipboard" }) },
		{ key = "x", mods = "CTRL|SHIFT", action = "ActivateCopyMode" },
		{ key = " ", mods = "CTRL|SHIFT", action = "QuickSelect" },
Expected Behavior
No response
No response
Anything else?
No response
          
I may be a bit dense, but I can't find this nightly build anywhere. I actually tried to find it before filing this bug (I looked at the releases page, tags and branches).
Anyway, I built from the main branch today, and I can't reproduce it anymore either. So it looks like it may have been fixed in the meantime...
          
https://wezfurlong.org/wezterm/install/linux.html has links to both stable and nightly builds.

Glad to hear that it is working for you!

I'm closing this as a duplicate of #1851
          
I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.