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How to change GDM3 login screen background


I'm trying to update my gdm3 login screen background.

I followed the instructions here: https://wiki.debian.org/GDM :

Customizing the GDM appearance
GDM v3.0+ allows for some basic customization, such as changing the logo icon, display background, and GTK theme. To do so:

Edit /etc/gdm3/greeter.dconf-defaults as root

Uncomment and/or modify the desired settings
Save and close the editor
Finally, run as root: dpkg-reconfigure gdm3

The command 'dpkg-reconfigure gdm3' will cause gdm to reload its configuration upon the next logout or reboot.

Note: When changing the background image, the target file must be world-readable.

But this did not work, I still have the default background.

Here's my greeter.dconf-defaults (other changes here have been picked up):

aclark@pleco 0 /etc/gdm3 $ egrep -v '(^#|^$)' greeter.dconf-defaults 

The background exists and is world readable:

aclark@pleco 0 /etc/gdm3 $ ls -l /usr/share/backgrounds/TNAwallpaper4K.jpg 
-rw-r--r-- 1 root root 2310969 Apr  3 10:34 /usr/share/backgrounds/TNAwallpaper4K.jpg

Running testing:

aclark@pleco 0 /etc/gdm3 $ cat /etc/debian_version 

Checking gdm3 is actually running, not light dm or something:

aclark@pleco 0 /etc/gdm3 $ ps -ef | grep '[g]dm3'
root       942     1  0 11:24 ?        00:00:00 /usr/sbin/gdm3
aclark    2779  2756  0 12:05 tty2     00:00:00 /usr/lib/gdm3/gdm-wayland-session /usr/bin/gnome-session

gdm3 version:

aclark@pleco 0 /etc/gdm3 $ dpkg -l gdm3
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
ii  gdm3           3.30.2-3     amd64        GNOME Display Manager

What am I missing?