Camera will produce many logs. Prepare two terminals with unlimited back scroll…
First, rm -rf ~/.cache/gstreamer-1.0/ (or /home/defaultuser/.cache/gstreamer-1.0). According to mal that test image shows up when the gstreamer droid plugin is already blacklisted. Now to find out how it gets blacklisted:
On one terminal, telnet or ssh (if telnet, su - defaultuser to switch away from root) and run GST_DEBUG=3 jolla-camera,
While in the other (actually start this first) you just run # logcat as root (devel-su if from ssh).
The output from logcat will be so large that you’ll probably not be able to use a paste service, a file hosting might be needed 