What is the problem?
Webcam shows no image, as well as temp data behaving very oddly.
What did you already try to solve it?
I needed to swap out the cable connection for the CR-6. This setup worked fine on an Ender 3, but the 3 utilizes an OTG port, which matched the USB cable from the Pi. The 6 has a USB Type C interface, and that may be the core of the problem.
/var/log/webcamd.log, syslog, dmesg, ... no logs, no support)
Additional information about your setup (OctoPrint version, OctoPi version, ...)
Newest version of Octopi & Octoprint, Rpi 3b+