Tiny shutter icon at the top-left corner of my screen

[pmorch]

Brief summary of issue

I see this weird icon at the top-left corner of my screen:

It doesn't seem interactive and I don't want to see it! 🙂

Steps to reproduce the issue

1. Start Shutter
2. Close the window (it remains in the task bar as a tiny icon-thingy because Preferences --> Behavior --> "Minimize to tray when closing main window" is true)
3. Lock the screen (Super+L)
4. Enter password to unlock
5. See the icon in top-left corner
6. Right-click on taskbar icon, Quit removes the icon.

Error output

None.

Extra information, such as Shutter version, display server in use (Xorg or Wayland), operating system and ideas for how to solve:

Gnome 47
debian 64-bit
Shutter 0.99.5