I'm not sure is it a bug or a suggestion, but n side economy overview, the chains that connected to mahogany wood or platinum ore are always a yellow, actually I think they should skip the minus value for those resources exactly as the mines and marbles/stone/granite deposit, make no sense to get them a yellow if there is no source for them until now, And I don't see any plan or any need to add a resource for them later.
So I think the chains must be green if the issue only the minus value of base source of those:
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