Unless I am mistaken, it has previously been confirmed that dynamics written in a score or part under a bar repeat ( (eg Shift+R, %2) are ignored.
It occurred to me this morning that I could simply adjust velocity or dynamics using the relevant lane in the editor, but I was surprised to discover that Dorico does not show notes in the editor that are performed within a bar repeat.
I feel sure that anyone who uses bar repeats would find it helpful to be able to control dynamics in these sections, either directly in the score or via the editor window.