Thanks a lot for your answer, Daniel.
Its interesting, but changing the settings according to the usual position doesnāt have any effect. Look here:

(Comment to your last paragraph: The two text styles are close in order to show the problem. I know, that I could override the text, but that would be a workaround for hundreds of similar situation in this symphony. So I thought its worth to ask before

)
I have realized, that in Dorico there are no magnetic auxiliary lines or absolute rulers in order to have an indication to align objects precisely. But I have a suggestion (I hope, my english is good enough to explain my suggestion)
Let say there is an object anchored at a given grid point in a staff, e.g. a staff text. So this object is placed with a defined gap between staff and/or notes above the staff. Normally the alignment in properties panel is shown as X:0, Y:0, no matter which position Dorico has calculated for this object (according to engraving options, minimum distances, distances to other objects, avoid collisions and so on). I think it would be helpful to know the absolute distance from the staff, too. Or the view option to switch from »relative« to »absolute« alignment.
Example:
Objects 1 and 2: some text, minimum distance to staff: 1, distance to other objects 1/2
Object 1 is placed above an empty bar. Its placed 1 above the staff. Dorico shows its calculated position: e. g. X=0, Y=1 (instead of 0/0 like now)
Object 2 is placed above a busy bar, lots of high notes, leger lines etc.: the object placed 1/2 above the highest note. Dorico shows the calculated position: X=0, Y=3 3/4 (instead of 0/0) ā (Ā»3 3/4Ā« is just a phantasy number.)
So, if you want to align objects 1 and 2 you easily know what to do, because Y=1 and Y=3 3/4 are both absolute distances from the same coordinate axis. In this example I can set Y of object 1 to 3 3/4 to reach the same position like object 2 instead of finding out that object 2 should have X=0, Y=2 3/4 to have the same hight like object 1 which still has X=0, Y=0.
Do you understand me?