{0.tag} not working anymore

[naoliv]

I don't know if it related with r6675 or r6677, but using {0.tag} doesn't seem to be working anymore.
Using the "element of" example and changing it to use {0.tag}:

node[amenity=parking] ∈ *[amenity=parking] {
          throwWarning: tr("{0} inside {1}", "{0.tag}", "amenity=parking");
}

I get this:

{0.tag} inside amenity=parking (1)

[simon04]

In 6681/josm:

fix #9570 - MapCSS validator: make {0.tag} work for child/parent/spatial selectors

[simon04]

This was no regression, but the feature had never worked for child/parent/spatial selectors.