@SecCamFan Yes, the camera is attached to the inside of a window using a third-party mount. I have assumed that the "ghost" image I was seeing was the camera in privacy mode, but now understand that...

@Solla-topee Have a watch of this video https://drive.google.com/file/d/1AFm5TKOvs4JgY00iglZgo775UKSlgvvT/view?usp=drivesdk

@Solla-topee All Privacy mode features are OFF for all the scenarios you cite. Nevertheless, if I toggle between Day mode and Night mode, the Privacy mode switches off and on respectively. So,...

I have 'solved' this problem by selecting DAY MODE. The problem recurs if either AUTO or NIGHT MODE is selected. So, it's a software bug, over to you Tapo!