Checkbox to "Start Dropbox on system startup" reverts to unchecked state

#### Issue:
Selecting the checkbox for "Start Dropbox on system startup" reverts back to unchecked state after closing the Preferences window.

#### Steps to Recreate:
Click the Dropbox icon in the system tray > Preferences
Check the box for "Start Dropbox on system startup"
Click Apply
Click OK
Go back into preferences and the box is unchecked

#### I've had this issue across the following distributions:

- PopOS 20.10 GNOME
- Manjaro GNOME
- Manjaro Cinnamon
- Manjaro KDE

#### Right now running Manjaro KDE with the following:
Operating System: Manjaro Linux
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.2
Kernel Version: 5.8.18-1-MANJARO
OS Type: 64-bit