ssh-askpass-gnome can't move window once opened

[muh muh]

Greetings ssh-askpass-gnome maintainers,

I am running:
  Kernel: 6.8.0-52-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0 
clocksource: tsc
   Desktop: Cinnamon v: 6.4.6 tk: GTK v: 3.24.41 wm: Muffin v: 6.4.1 vt: 
7 dm: LightDM v: 1.30.0
     Distro: Linux Mint 22.1 Xia base: Ubuntu 24.04 noble

I have installed:
ssh-askpass-gnome 1:9.6p1-3ubuntu13.5
via Debian Package Search 2.8.1

I have been very happily using ssh-askpass-gnome for various things, but 
I have run into an inconvenience that really could be considered a bug. 
It is:

I can't move the ssh-askpass-gnome window.

I have no idea why this happens. Can you fix it?