Currently on the Google Pixel 3A work is in progress to make the camera work. Currently it works but only once per boot. Kamoso will show a picture briefly after which it crashes while for example GNOME's Snapshot shows an image for the entire time the application is open (until the user closes and restarts it).

When it crashes the following error is thrown:

$ kamoso 
kf.kirigami: Failed to find a Kirigami platform plugin
error debugMessage: stream error: error set output format: -22 (Invalid argument)
error: "../src/gst/gstpipewiresrc.c(704): on_state_changed (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:/GstPipeWireSrc:Built-in Front Camera"
Stop

(kamoso:4067): GLib-GObject-CRITICAL **: 22:19:49.651: g_object_notify: assertion 'G_IS_OBJECT (object)' failed
error debugMessage: stream error: error set output format: -22 (Invalid argument)
error: "../src/gst/gstpipewiresrc.c(704): on_state_changed (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:/GstPipeWireSrc:Built-in Front Camera"
Stop

(kamoso:4067): GLib-GObject-CRITICAL **: 22:19:50.108: g_object_notify: assertion 'G_IS_OBJECT (object)' failed

(kamoso:4067): GLib-GObject-CRITICAL **: 22:19:50.108: g_object_notify: assertion 'G_IS_OBJECT (object)' failed
error debugMessage: stream error: error set output format: -22 (Invalid argument)
error: "../src/gst/gstpipewiresrc.c(704): on_state_changed (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:/GstPipeWireSrc:Built-in Front Camera"
Stop
Segmentation fault

I understand not being able to show a camera image when this happens but the application should at least not crash and show an error instead.