I agree with putty. It definitely feels like your carry over points are lost unless you have a tech queued up. example: end game i can queue up techs and research 3+ per turn, but if i don't do that and switch to a different tech path, i can only do 1 per turn. Might be confirmation bias on my part tho, ill have to pay more attention to it. Same if i don't queue up but just select 1 each, a lot of carryover is lost then: it will take 3 turns to research them 1 at a time, vs 1 turn with queue up.
The carryover is still there, but it's not being applied right away. Even if you take the 3 turns vs 1 turn, it still accumulates carryover, so the only thing you lose is time. The research will continue to carry over until you select a tech big enough to fit all the research at once, and then it applies it once you click "next turn", even if you set your research to 0.
We know it works now because it WAS an issue in beta, and it WAS fixed.