Inconsistencies on children count for Copy, Rename, Delete actions

Try to copy a parent page A with default Administrator user. See images.

• copyChildren.png shows 2 children are affected by the change,
• but if you go in ?viewer=children you can see 6 results, see viewerChildren.png
• while the Homepage Tree displayes 7 entries, see homeTree.png

Notes:

• Existing pages: A, B, C, F, G, D Terminal
• Non existing pages: E, D
  • Deleted pages: D

• the copy children count, counts only direct (B.WebHome, A.WebPreferences)
• the tree displays also non existing pages (E), but no WebPreferences
• the children view, doesn't count non existing pages, but counts WebPreferences

The count from Copy, Rename, Delete should show the same number. I think the correct is '6'