Diplomatic optimization... wrong and... wrong.

I can confirm this playing as Terrans. The "Research Treaty" specialization for the "Diplomatic Optimization" Tech unlocks the "slave brokering" treaty, which gives a "5% bonus to colony manufacturing and wealth due to the other civilization agreeing to open slave markets". These kind of mistakes are nothing unusual; there appears to be quite a few mistakes in the tech tree if you look for them.

Thanks for the report.  We've addressed the issue in our internal builds and it should go out in our next release.