Labels in Clusters Not Working

I have developed a pretty large definition that has within it several Groups and I have made extensive use of Scribble labels to clarify what’s going on. When I select all the groups and components and labels and try to make a Cluster out of it, the Cluster is made, but the Scribble labels are left behind, outside the cluster. What am I doing wrong?

I’ve discovered that its not enough to just window-select all the groups and components and text labels on the screen - you have to zoom in close enough to read every text label and specifically shift-select it or it gets left out of the Cluster. I don’t know why selected the Group the text lives in isn’t enough, but apparently its not.

So that’s my work-around.