The heroic one appears once you have successfully completed the mission, but I think it would be nice if they could somehow place a mission marker for the regular mission after you have activated it and reached a certain checkpoint in the mission.
It would make it much less frustrating for people that are trying to do it for the first time if they didn't have to wait around hoping to not get screwed over by RnG with a run of Cabal Excavation PE's after failing at the final boss room.
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AKA how Destiny 1 had it lol