I'm creating a building block that spans several pages and that has a different orientation/headers/footers from the main document.
In order that the orientation/headers/footers are created, my building block includes a continuous section break at its beginning and end.
I've chosen to "Insert Content Only" and placed it in Custom Gallery 2.

Bizarrely, when I use the building block it adds an additional page after the continuous section break. This page uses the orientation/headers/footers from the section preceding my building block and it can't be deleted. At least not without losing all the orientation/headers/footers that the building block section requires.

Interestingly when I select exactly the same portion of the text used in the building block and copy/paste into a sample document this doesn't happen.

So, any ideas why and how I can solve this problem?