Subtype localisation does not appear in tooltips

[maxice8]

types = {
    type[event_modifier] = {
        path = "game/common/event_modifiers"

        subtype[not_flag] = {
            ## cardinality = 1..inf
            scalar = scalar
        }

        localisation = {
            subtype[not_flag] = {
                name = "$"
                description = "desc_$"
            }
        }
    }
}

This occurs anywhere subtypes are used