TYPO3 Core

Classes that used to be selectable via the "Style"-field are missing from the link-wizard, possibly after 6.2.20 or 6.2.21 upgrade. The dropdown-field "Style" is present in the wizard, but it has no options to choose from on either tab.
The problem has ocurred recently and is present on multiple sites. All sites run 6.2.21.

The TSconfig for this looks like this:

RTE.classesAnchor {
    specialLinkPage{
        class = speciallink
        type = page
    }

    specialLinkURL{
        class = speciallink
        type = url
    }

    specialLinkFile{
        class = speciallink
        type = file
    }

    specialLinkMail{
        class = speciallink
        type = mail
    }
}

RTE.default {
    proc.allowedClasses (
        speciallink
    )

    buttons.link.properties.class.allowedClasses = speciallink
}