The problem seems to occur when my filter includes one instrument and excludes the other instrument help by the player of the top staff. In this case, it is a player with alto and soprano sax.
Another little bug in this area is that when I change the filter, I get NO rehearsal marks displays. If I toggle the filter off and back on, then the rehearsal marks appear again. Here is galley view with no filters, normal.
Dorico seems to place the rehearsal mark above the first row that has the player’s first instrument displaying, but it should place the rehearsal mark above ANY instrument that is displaying.
Yes, it is an unusual combination of circumstances. Not a huge problem, but worth sorting out on a maintenance release.
Also, I mentioned that in this scenario, often the rehearsal marks don’t display at all until you un-click the filter and then re-click the filter. No real harm done, but it took me off track for 30 minutes trying to figure out if I had damaged something.