Color Picker Tool in the Change Foreground Color dialog

[Danbor]

I'm running GIMP 2.10.30, not flatpak, on Mint Cinnamon 21.3 and the color picker eyedropper in the change foreground color dialog box does nothing at all. The color picker tool itself works, but in the foreground color / background color change dialog boxes, nothing. Even the mouse pointer remains set to whatever tool is currently selected.