After more experimentation, it's apparently happening only to the Panzer Gren company shown in the screen print. I've tried quite a few others and they all work normally.
With the larger formations, the individual unit data does not show unless you press "show unit data". That's been there since the game began. The room on the screen is needed to show the formation details.
Not a bug, it is how the game behaves, no plans to change.