Helicopter Zoom Bug

The zoom does not work properly. I have the Zoom camera binded to Z. Then, I also use mouse wheel to scroll the zoom. Today, for helicopter, I notice that Z can only zoom in, but not out. To zoom out, I need to use scroll wheel. But not only this, there’s no granularity. It’s either full zoomed in or full zoomed out. Please fix.

Check your control key binds.