[BUG] Presets not working

[alsmithson]

Observed behavior
I select a preset and click the up arrow. Nothing happens. Settings don't change on screen, and the camera does not change (I am just trying to change exposure for now). I can adjust settings in the upper window and the camera responds correctly. I can save presets (I think) because they show up in the drop-down box, even after a reboot. But I can never apply them manually, and they will not auto-loaded either (I have one set to auto-load 3 times).

Expected behavior
When I select a preset and click the up arrow, I expect the preset to be applied to the camera.
When OctoPrint starts, I expect my preset to be applied to the camera.

OctoPrint Version
1.9.3

CameraSettings Plugin Version
0.4.3

Camera
Logitech C920

Linux/OctoPi
OctoPi 0.18.0

Other Plugins
Do you have any other plugins that may be modifying the camera stream?
No, I read the FAQ. I don't have any other camera plugins. I uninstalled OctoLapse because it is broken.

[The-EG]

Please enable debug logging for this plugin (Setings->Logging, create a new entry for camera settings and set it to debug), reproduce the behavior and then attach your octoprint.log here. And please include an entire section of the log, not just what you think may be relevant.