Handling all book components does not select all items

This is at least an annoyance - because I'm not certain about the consequences:

In the book window, with SHIFT held while selecting File I get options to Savel All files, open All files etc.

I have noticed that just before the operation is performed, the selection of the book components is not complete:

Fortunately it turns out that all book components had been saved (time stamp checked), although the last two are not selected in the book file. But the incomplete selection makes one suspicious.

Klaus