The fast pronunciation is /'bœnnər/ and the slow pronunciation is /'bœndər/. Does that seem about right?
There shouldn't be any ds so it owuld be like your first example. Just remember to use the correct tone /bòènnér/, so people don't think you're talking about bønner(beans/prayers).
I've just spent a whole lot of time making myself feel stupid by listening to the two tones and not being able to distinguish them. And I can distinguish them in Swedish and Mandarin. :-p