Crossref Plugin: issue DOIs can't be set "marked active"

Hi, we switched from datacite to crossref for DOIs some time ago.
Now, some journals in our OJS 3.3.0-13 have some old issues and articles with datacite DOIs, but while articles can be set as “marked active” in the crossref plugin settings, issues can’t because not considered at all by the plugin.
The result is that old issue datacite DOIs are sent to crossref with every new DOI registration, resulting in errors.
How is possible to prevent sending old issue datacite DOIs to crossref?
Best regards
Stefano

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