This is going to be a mess, tasks left in random places by incomplete closures: https://phabricator.wikimedia.org/maniphest/query/eeh59yEaq59d/#R
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...and Bugzilla has/had a "Spam" product and some BZ products have/had a "General/unknown/other" component which might be comparable (but not sure).
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@Nemo_bis, you could help by assigning the tasks you author to a project... :)
If this is a problem, we can create a Trash project and throw there all the closed tasks that don't fit anywhere else.