Thank you Lillie_Harris!
Yes you are right. Transposing upwards by steps of intervals of a second, the problem remains, until you reach a point that the last note is a B. Also, transposing down (from the original) the problem remains until a point that the last note is a D, where the command “force centered beams” does nothing at all. 
Anyway, I hope the team will fix it.
These short scales are from Bach’s Chaconne (I am writing a guitar transcription to learn Dorico). In Finale it was easily written as seen below:
Anyway, being a 20 years user of Finale I get a bit confused sometimes, although I find Dorico’s concept much better.
Thanks again
Kostas