Transparency shading, tilesets this time

When letting the user change alpha values of this tile sets (i am using inverted color alpha slider from an other demo here but mapped alphs) we get blown out colors instead.
Not sure how to even debug this

tileset1.style = new Cesium.Cesium3DTileStyle({
pointSize : 3,
color:
"undefined === ${COLOR}.x ? color(‘white’, " +
alpha +
" ) : rgba(${COLOR}.r * 255, ${COLOR}.g * 255, ${COLOR}.b *255, " +
alpha +
“)”,
});

image

Error is with our data