Citation of special issues

Plugin: citationStyleLanguage

We have some journals who beside their regular issues every now and then have special thematic issues. These do not follow the volume/issue numbering, but instead get titles. These titles are correctly displayed on the article details page (so information supplied to OJS are correct) , but do not show up in any of the citation formats.
However, titles of special issues should be included (i.e. How do I cite a special issue of a journal? | MLA Style Center).

Can anyone confirm this behavior, or has any ideas how to fix this?