[Python] Having trouble displaying an image in an Adw.AboutDialog in python

I have the following file structure:

.
├── resources.gresource
├── resources.xml
├── texty.py
└── texty.svg


The resources.xml:

<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/texty">
<file>texty.svg</file>
</gresource>
</gresources>


Compiled using:

glib-compile-resources resources.xml --target=resources.gresource


...and registered in the texty.py init function:

resources = Gio.Resource.load('./resources.gresource')
Gio.resources_register(resources)


Retrieved like this it works:

image = Gtk.Image.new_from_resource('/texty/texty.svg')
box.append(image)


...but not in the AboutDialog code:

about_dialog = Adw.AboutDialog.new()
about_dialog.set_application_name("texty")
about_dialog.set_application_icon("/texty/texty.svg")
about_dialog.present()


I get a 'broken image' displayed. No errors. This works in C-code. Is there something different I need do in python? I tried using a png with the same result.

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