Fader as external input for buttons

[siegmund]

Hey guys,

I recently noticed some sort of strange behavior when using a fader as external input for a button.
Please have a look at the attached workspace. The slider is the input for the button via loopback.

As long as you move the slider, the Blinder button is toggling. Seems like there is no real system behind the toggling.

I would have expect the button to be disabled as long as the sliders' value is 0 and be enabled otherwise.

Am I missing something obvious?

Regards,
siegmund