IEEE Citation shows up as static citation in LibreOffice

I am using Zotero on my Linux System with LibreOffice.
Sporadically, I noticed, that somtimes a citation like [12] shows up not as a dynamic field, but as a static string.

Sometime I have to do a line break, then add the citation, then pull that [12] back in the line above.

The funny part, hovering over a static citation shows the link text from zotera. But refreshing does not affect those strings.

What can I do, what did I miss?

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