DORICO 4, its MIXER and PLAY mode

Hi,
Subject close to the tuplet one. In a syncopated rhythm I have a quaver that is notated as two semiquavers tied. In notation options I have chosen everywhere a “full” note instead two “half notes tied” and it changed nothing, still two tied semiquavers. The consequences are bizarre, because these two tied semiquavers are marked staccato, but Dorico plays one natural quaver instead of one staccato quaver. When I untie them both s-qs are played correctly, but obviously twice instead of once. I know a workaround and used it to continue working, but question remains, is it as intended or is it a bug?
As usual, if I make something wrong I will be happy to be enlightened.
If, on the other hand, this is not as intended I officially signal a bug.
Witold