The issue there can at least be hit during upgrades, on the machine I'm currently using which is on bionic
$ LC_ALL=C eog
(eog:5727): GdkPixbuf-WARNING **: 15:51:18.029: Cannot open pixbuf loader module file '/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache': No such file or directory
Gtk:ERROR:../../../../gtk/gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /org/gtk/libgtk/icons/16x16/status/image-missing.png: Unrecognized image file format (gdk-pixbuf-error-quark, 3)
gdk-pixbuf is being upgraded
iU libgdk-pixbuf2.0-0:amd64 2.36.11-2 amd64 GDK Pixbuf library
The issue there can at least be hit during upgrades, on the machine I'm currently using which is on bionic
$ LC_ALL=C eog
(eog:5727): GdkPixbuf-WARNING **: 15:51:18.029: Cannot open pixbuf loader module file '/usr/lib/ x86_64- linux-gnu/ gdk-pixbuf- 2.0/2.10. 0/loaders. cache': No such file or directory
Gtk:ERROR: ../../. ./../gtk/ gtkiconhelper. c:494:ensure_ surface_ for_gicon: assertion failed (error == NULL): Failed to load /org/gtk/ libgtk/ icons/16x16/ status/ image-missing. png: Unrecognized image file format (gdk-pixbuf- error-quark, 3)
gdk-pixbuf is being upgraded
iU libgdk- pixbuf2. 0-0:amd64 2.36.11-2 amd64 GDK Pixbuf library