The Problem: The camera viewport is not working when I switch to camera view using "Numpad 0". The camera outline guides do not show as they usually do, and the Camera Perspective viewport does not render in any setting except for the viewport shading "Rendered" setting of which the guides do not appear.
What I was doing when the issue developed: I was renaming the cameras and I may have caused a mismatch with the camera and it's label. I attempted to use illegal characters in the name, for example "C-Camera". I may have accidently hit a random key while attempting to label the cameras.
I have checked:
- The camera is not clipping
- The camera is the active camera for the scene
- I have deleted all cameras and tried to re-add the cameras.
- The Resolution X is 1920 px and the Resolution Y is 1080 px.
Does anyone have any idea on how to fix this and reset the camera guides?

