Hi there,
I upgraded OctoPrint to python 3 following https://github.com/cp2004/OctoPrint-Upgrade-To-Py3
Everything worked fine, but the RGB-Status plugin is now stuck in setup mode:

The user pi is member of the group gpio:

Just following the setup wizard by clicking "Add gpio Group" doesn't work either. The problem is reproducible. Tried several times installing, uninstalling, rebooting ...
Plugin version is 1.7.2, octoprint version is 1.4.2. I don't use OctoPi but installed Octoprint myself on Raspberry OS lite 2020-08-20.
Btw. uninstalling RGB-Status plugin helped me, being able to use Octoprint again: https://community.octoprint.org/t/i-installed-a-broken-plugin-how-do-i-uninstall-it-again/217
/home/pi/OctoPrint/venv/bin/pip uninstall RGB-Status
is the command if you installed octoprint yourself following https://community.octoprint.org/t/setting-up-octoprint-on-a-raspberry-pi-running-raspbian/2337
I hope you can fix this issue.
cheers