Privacy Mode does not turn off
**Describe the bug**
When I turn on the privacy mode, the replacement image appears.
In the snapshots and in the stream.
When I turn off the mode again the stream is back to normal but the snapshot still shows the replacement image.

Only a restart of Homebridge solves this problem for me.

Is there a solution to this problem?

**To Reproduce**
Switch privacy mode on and off again



**Screenshots**
![C2D594C7-C0B4-4BC8-900B-B72B595FFC28](https://user-images.githubusercontent.com/30412987/161148070-2e7cce92-cfed-43ef-852b-40af741c944e.jpeg)

**Environment**
- Node.js Version: v16.13.2
- Homebridge Version: v1.4.0
- Camera UI Version: v5.0.16
- Operating System: Ubuntu Server 20.04.3 LTS
