Using gnome-screenshot to capture window, shadow effect is twice large

[pled]

Info

• Materia version: materia-gtk-theme 20210322-1
• GTK3 version: 3.24.31
• Distribution (and version): Debian bookworm
• Desktop environment (and version): Gnome 41.2
• Related application (and version): gnome-screenshot

Actual Issue - Steps to Reproduce
Take a window screenshot with gnome-screenshot tool (Alt-PrintScreen shortcut) : the shadow area around window is twice when materia theme, compared to default Adwaita theme.
This makes such screenshot difficult to insert "as is" in a doc, it looks like a big margin is applied.

See below :