APA7 style bug: capitalization of several subtitles

According to APA7, the first word of a subtitle should be capitalized (https://apastyle.apa.org/style-grammar-guidelines/capitalization/title-case). The CSL style does this for the first subtitle, but not for more than one subtitle.

This is my title: With a nice subtitle: but some authors just use more: and more: and more
  • This is controlled by the citation processor (citeproc-js) rather than the APA style itself. For a second subtitle, one common choice is to punctuate with a period rather than a colon (e.g. 'Cirencester: town and landscape. An urban archaeological assessment').

    Alternatively you might be looking at a part or volume title, which can be added to the Extra field using the following form:

    volume: 3
    volume-title: Volume the third
    part-number: 2
    part-title: Part the second
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