Shift key (modifier) works for button functionality but not for light feedback (out)

Hi
So there is a script for Pioneer's DDJ 200 which I am adapting, don't laugh, I don't need cue button so checking how it will function as a shift (toggle) key / modifier.
I have
linked it with modifier 1, made it toggle its value between 1 and 0
made the button light up when mod 1, checked against modifier values - all works fine so far

Now, the hotcue buttons should only have hotcue functionality when cue/shift button is off (modifier 1 = 0). This appears to work just fine, only when cue button is not lit up.

Still, when I try to have the hotcue button lights to be on only when cue/shift button is off - so adding a condition, when modifier 1 = 0, but this makes no difference.

What could be wrong? I tend to think something might be messed up with the traktor version.