Does the eyedropper button in OpenFX LightRays do something?

In the OpenFX LightRays effect under Appearance, there is a Color field where you can either select a basic color or expand it and pick a color from a field, and when you expand it there is also the option of selecting a color from the screen.

Next to the Color field there is also a clickable eyedropper symbol, but as far as I can tell this does not do anything, at least not allow selecting the color from the screen like when you expand the menu.

Is that a bug or is this button just there to indicate the function in the expanded menu?

Next to the Color field there is also a clickable eyedropper symbol, but as far as I can tell this does not do anything, at least not allow selecting the color from the screen like when you expand the menu.

It works for me. On the color page I click the eyedropper, then move the mouse and click anywhere in the viewer to pick a color.

On the fusion page it works a bit differently. You click the eyedropper without releasing the mouse button, then you move the cursor to the viewer.

Next to the Color field there is also a clickable eyedropper symbol, but as far as I can tell this does not do anything, at least not allow selecting the color from the screen like when you expand the menu.

It works for me. On the color page I click the eyedropper, then move the mouse and click anywhere in the viewer to pick a color.

On the fusion page it works a bit differently. You click the eyedropper without releasing the mouse button, then you move the cursor to the viewer.

I didn't think of moving the cursor without releasing the button, thank you!