Science Overflow Darwin and other great scientists

[collyn.messier]

I brought darwin to the galopagos and activated him. Should get 1500 science (Yikes thats a lot!). But it seems to only net one tech. All of that extra science falls by the way side. Whats up with that and how can I actually get all that yummy science.

I've tried a couple things like activating with no tech activly being researched (makes it take an extra turn to learn the tech)
Selecting a future tech so it should auto select the next tech in series (gets the first one then prevents me from selecting a new tech until the next turn).
and selecting one tech and then another once its done (same as above)

Anyway to fix this? Am I missunderstanding how science works in civ6, or this ability?

[Carog the Fat]

whenever ii have used darwin or he moutian bonus guy I have had several techs all researched at 1 turn, but omly onea turn.