Zotero file attachment breaks citations

[Moooongo]

Context:
For every entry in Zotero, it is possible to add a file attachment, commonly being a pdf copy of the original paper. This pdf copy is stored both saved locally under "Zotero\storage" and uploaded to the Zotero server.

Symptom:
If a file attachment is present, the citation manager will cite the copy of the pdf file in zotero storage instead of the information from the Zotero entry.

Example of metadata that cites the pdf file, id scratched:
{
"id": "some id",
"type": "article",
"title": "Yu et al. - 2003 - Efficient frequency doubling of a femtosecond puls.pdf",
"system_id": "zotero|12432300/MKFTLI3R"
}

Temporary solution:
If the pdf file is removed from Zotero client, it is not automatically removed from "Zotero\storage". For the citation manager to work properly, the local folder directory of this citation, "Zotero\storage\MKFTLI3R" in the example, also needs to be deleted.