Hi DW,
As the title states when making a copy of an area with "Do not include URL in subpage URLs" turned on, it causes some pages to not get copied correctly.
Test below is made on a 9.17.5 clean swift install.
Settings on the "Swift B2C demo shop (Master)
Making a copy of the Master site
You can see that the page count is different on the new area
If i then turn off the setting and copies again, all the pages are included
Copy master area again.
You can see that now all the 150 pages are copied correctly.
Looking forward to your response :)
Best regards,
Mikkel Hammer