Which one is correct?
I’ve added changes/fixes which we discussed yesterday.
I’ve added changes/fixes about which we discussed yesterday.
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"Discuss" is transitive; you discuss a thing, you never discuss about a thing. As such, "about which we discussed" is simply incorrect.
Compare to "talk". You talk about a thing, you never "talk a thing". So the opposite would be true and you would have to say "the thing about which we talked", in this case.