Hi @bozana, thanks for your your answer and sorry for late in mine.
We do not add articles to datacite issues in general, we just have almost two journals that in one case needed to add an introduction to an already published issue, in an other had a datacite issue with some datacite articles to complete in the moment that we switched to crossref.
In other words, currently all our journals use only crossref for both issues and articles.
I hope that there is a right way to provide issue data in such a case (when issue has a different DOI): if you need an exaple to submit to crossref, you can give this crossref article DOI 10.54103/2724-3346/18911 published in an issue with this datacite DOI 10.13130/2724-3346/2020/2
Waiting for the plugin managing of those rare cases, do you think that marking the crossref articles DOIs linked to datacite issue DOIs after the first registration would solve the problem that the plugin daily tries to register datacite issue DOIs to crossref?
We think that this can damage the scheduled task (Crossref warning).
Best regards
Stefano