I try to repruce this problem in a complete new score just to exclude that I did some wrong things whereever.
A) The problem. Start with a2 and have some funny breaks in the 1st voice.
B) The same figure starts immediately after the “wrong” bars - voila! That’s how it should be.
C) Shows that’s not a problem with a new system. But to exclude this, I started a new system with a break. (E)
D) Even in the middle of the system the problem still exists, if I start with an a2 after a break.
So that brings me to my old teacher in composition who always said: “Even breaks are music!” - I think, Dorico assumes the a2 region goes until the two in the after next bar. (E)
Because in (F) I started the bar not with a break but with a note. And the miracle of the correct bar-break is solved.
But even breaks are music - so my question is: follows this engraving standards or is it still a bug?
Sorry - didn’t recognize your post@jester - you said the same like me but shorter