Plus sign is not imported using COinS

I use the lastest stable release and I have a problem when I import citations containing a plus sign in the title of a jounal article. In all cases, the plus sign is replaced by nothing, i.e, "Ca2+ is calcium" become "Ca2 is calcium".

The reproduce the problem, simply export a citation containing a plus sign to HTML using zotero and try to re-import the same citation.

Is someone else have this problem ?

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