locateOnScreen on Ubuntu Linux no longer working

[tsmaster]

I just updated my Ubuntu machine to 26.04, and a pyautogui script that I've been using is now failing with the following error output:

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** Message: 08:03:58.135: Unable to use GNOME Shell's builtin screenshot interface, resorting to fallback X11.

(gnome-screenshot:17621): Gdk-CRITICAL **: 08:03:58.135: gdk_pixbuf_get_from_surface: assertion 'width > 0 && height > 0' failed

(gnome-screenshot:17621): GdkPixbuf-CRITICAL **: 08:03:58.135: gdk_pixbuf_get_width: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(gnome-screenshot:17621): GdkPixbuf-CRITICAL **: 08:03:58.135: gdk_pixbuf_get_height: assertion 'GDK_IS_PIXBUF (pixbuf)' failed
*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug

the code I'm running looks like

loc = pyautogui.locateOnScreen(FILENAME,
region=(0, 0, scr_x, scr_y))