Alt+1 Alt+2 ... custom shortcuts don't work (for switching tabs)

[abitrolly]

➜  ~ cat ~/.config/terminator/config
[global_config]
  window_state = fullscreen
[keybindings]
  split_vert = <Primary><Shift>k
  switch_to_tab_1 = <Alt>1
  switch_to_tab_2 = <Alt>2
  switch_to_tab_3 = <Alt>3
  help = ""
[profiles]
  [[default]]
    font = Monospace 10
    scrollback_infinite = True
    use_system_font = False

Describe the bug

After setting Alt+1 Alt+2 shortcuts for switching tabs, they don't work. Only default Ctrl+1 Ctrl+2 work.

To Reproduce

1. Set Alt+1 Alt+2 for switching tabs
2. Open new tab
3. Press Alt+1 and Alt+2 to see nothing happes

Expected behavior

Expected tabs to switch

Screenshots

Desktop (please complete the following information):

• OS or Linux Distribution: Fedora
• Version 40
• Display Technology: Wayland

Additional context
Add any other context about the problem here.