The same key biding can be used to refer to more than one action when set in Preferences > Keybindings tab. As a result, such a key binding will always trigger one action (always the same one) while other actions associated with that key bindings will be ignored.

Steps to Reproduce:

1. Open Preferences.
2. Go to the Keybindings tab.
3. Make sure that 'Toggle fullscreen' action uses F11 as a key binding - if not, make it so.
4. Repeat Step 3 for the 'Edit terminal title' action.
5. Now both 'Toggle fullscreen' and 'Edit terminal title' actions should refer to the same keybinding, that is F11.
6. Close the Preferences window and press F11 - this will trigger 'Edit terminal title' action but will ignore 'Toggle fullscreen' action.

I'll create a PR soon that should fix this by not allowing to set duplicate key bindings in the Preferences > Keybinding tab.