I created a scene that specifies some individual bulbs, and it works fine. Later it occurred to me I could simplify things if I created a group for those bulbs, and then include the group in the scene instead. The rule machine allows me to do that (i.e. the list of available devices in the drop-down menu shows both the bulbs and the group I created).
However I found that the capture feature didn't work when the scene is defined using the group. The settings of the bulbs in the group does not update when I execute the capture command. I searched the documentation but found nothing that prohibits the use of groups in a scene. Is it just not documented or perhaps there's something going on with my setup that's not right?