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Joined: Mar 2004
I've never tested rigorously on beaker overflow, but I've done things like research Drama - Music very late in the game and had much more than one turn's worth of overflow beakers after that.
It's easier to understand if you understand the reason behind limiting hammer overflow. If not for that rule, then you could store up an enormous hammer surplus by repeatedly building cheap units, then crash-complete a wonder in one turn with the surplus. That's not necessary for beakers since you can't repeatedly research cheap technologies, and because excessive beaker production in a single turn doesn't really create any competitive imbalance (we do it all the time with binary research.)