These kinds of problems have plagued kmail for many, many years, dating
back to the beginnings of kmail2 (at least). As we can see from the
numerous upstream bugs, there is also no shortage of reports (IIRC, I
filed one myself for fake duplicates years ago). Perhaps upstream
doesn't care, or it's really rare and difficult to reproduce or fix, I
don't know.
It may sound cynical, but my advice would be that if you're hit with
this, change mail clients :/
In the context of freeze/release, I'd suggest to tag this jessie-ignore,
or even forever-ignore.
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