See the attached pictures. In the first one I pick a recording from the suggested recordings box. Here you can see that the recording disambiguation comment is shown in the box (I guess this was added in MBS-879).
However, as you can see in the second picture, after I picked the recording, the comment is not shown in the "recording" column of the disc.
When I switch tabs, say to "Edit Note" and back, the comment will actually be shown there. And it's also being shown for the other recordings where nothing was changed. So I guess it just doesn't get carried over from the suggestion box.