Is "repeat-image-opacity" working

[Allroads]

Hello,

I was trying.

"repeat-image-opacity"

It does not seams to work, is this correct?

Reading, searching about it, I think it is a bug.

/* SIDEWALK on footway EXTENDED highway EXTENDED*/
way|z18-["footway"="sidewalk"]::footway_sidewalk_layer {
    repeat-image: sidewalk-footway.svg;
    repeat-image-phase: -50;
	repeat-image-align: center;
    repeat-image-offset: 0;
	repeat-image-height: 800;
	repeat-image-spacing: 600;
	repeat_image_opacity: 0.5;
}

Mentioned here:
10238

Mentioned here Line Element
Fields inherited from interface org.openstreetmap.josm.gui.mappaint.StyleKeys

Mentioned as constant Field values

Example:

I must tweak this image on every zoomlevel,it is too big and it must be a hint on the footway. Also on the highway road. For the whole set of images. Therefor I need prop "repeat-image-opacity"

Opacity tweaking inside mapcss is easier, then make new images every time.