"Webcam stream loading" forever after update re-flash

Camera model

RPi Camera Module 3

What is the problem?

The control page shows "Webcam stream loading" in the viewer forever.

What did you already try to solve it?

Power cycle of whole system. Also checked to see if the camera was recognized at the command line:
supported=1 detected=1, libcamera interfaces=0

Have you tried running in safe mode?

Yes

Did running in safe mode solve the problem?

Nope

Systeminfo Bundle

You can download this in OctoPrint's System Information dialog ... no bundle, no support!)

attached
octoprint-systeminfo-20251205172217.zip (20.9 KB)

Additional information about your setup

OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
Raspberry Pi 4 B, browsing from Mac OS & Safari. Was working fine before I reflashed my card to update Python. I restored the previous setup from a backup (using OctoPrint's backup/restore).