class at different zoomlevels for dashes, not overruled

[Allroads]

/******************/
/* EXTENDED */
/* CROSSING CONFIGURATION way highway */
/******************/

/* CROSSING FOOTWAY highway EXTENDED*/
way|z20-[footway=crossing]::footway_crossing_layer {
        set dashzoom20;
        width: 12;
        color:  #808080;
        z-index: 2;     
}
way|z21[footway=crossing]::footway_crossing_layer {
        set dashzoom21;
        width: 22;
}
way|z22[footway=crossing]::footway_crossing_layer {
        set dashzoom22;
        width: 40;
}
way|z23[footway=crossing]::footway_crossing_layer {
        set dashzoom23;
        width: 80;
}
way|z24-[footway=crossing]::footway_crossing_layer {
        set dashzoom24;
        width: 120;
}

/*set dashes crossing classes*/
way.dashzoom20 {
    dashes: 4,7;
}
way.dashzoom21 {
    dashes: 6,10;
}
way.dashzoom22 {
    dashes: 8,20;
}
way.dashzoom23 {
    dashes: 15,30;
}
way.dashzoom24 {
    dashes: 25,50;
}

I expected dashes but got this.

How to achieve this?

What I want is that I set the code so that on a few lines in the style, the dashes configuration is written, so that I do not have to set it for all the other crossing value combination, all by hand. To reduce mistakes.

So that I can tweak later easier the dashes for all.

At the end I should look like this.

[Allroads]

The more I think about it, it is a bug that earlier set class is not overruled.

[Allroads]

The more I think about it, is it a bug?
For me it is a big issue to align the images on different zoomlevels. If not solved my project stopped. Then I can not achieve, what I want to. Hints in the style for the road extended.
Must be set on a few code lines, there are a lot of combinations.

Earlier I used ::layer and prop to set the value for that zoomlevel.
But then the base key/value must be set.
example: [higway=crossing]::crossinglayer
When then set crossing_ref=zebra the data is propped. The crossing_ref image is visual.
But when the key/value is missing highway=crossing, the crossing_ref image is not shown, although the tag is there.
It must show up for control reasons. Missing/false tag.
Shown when a tag is there.

A lot of combinations, with legend on zoomlevel.

Can you help?