Clicking the Override option when attempting to replace a keyboard shortcut with another key that is already bound will not update the settings.
Unbinding the key before rebinding it to the new shortcut will allow the new setting to be accepted.
No - The same behavior exists in 4.13.2
Pop up window closes but shortcut setting is unchanged
Z is set as Forward and FOV Zoom Out becomes unassigned
Head over to the existingAnswerHub thread and let us know what's up.