I did a fresh install of pmOS edge with the official build of sxmo-de-sway 1.9.0 on my OG pinephone.
When I pressed the "Camera" item on the system menu, nothing happened.
I then tried to run megapixels from the command line and got some sort of GL_FRAMEBUFFER assertion failure, and megapixels crashed before opening the window.
I then tried again, from the command line, and it worked. However, there is still an error about "Failed to get display configuration: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.Mutter.DisplayConfig" does not exist.
I tried opening megapixels again from the command line, and got the GL_FRAMEBUFFER assertion failure again.
It's apparently a GTK issue:
with an available fix: https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/4570