[Bug]: Nest Cam Thumbnails no longer update
### Describe the bug

The plugin works fine - I'm able to see all of my cams in the Home app and view them live.  However, the thumbnails shown on both the Home tab and in individual rooms are stale and refuse to update.

This wasn't previously an issue - it's a new bug.  Everything else appears to work and function as expected.

Also note - this is not an issue in the Home app on MacOS Montery - only on IOS.

### Debug Output

Not seeing any errors/warnings in Homebridge

### Steps to reproduce

1. Open the Home app
2. View Nest Cams on Home tab or individual room
3. Note the thumbnail says 'now' for having been updated, but the thumbnail is old/stale.

### Device Type

Raspberry Pi 3

### iOS Version

15.2.1

### Camera Types

Multiple Nest Cam Outdoor

### Bug Persistence

Consistently

### Last Working Version

_No response_