Why aren't topics with Dita 1.3 in the metadata coming across when I use ant to generate the html files from my .xml files created in Framemaker?

We have been creating documents under Dita 1.2 in FrameMaker and running ant to convert them to html files to create webhelp. I want to update to dita 1.3 as I want to use ResponsiveHTML5 help. But when I generate the help, any topics created with the Dita 1.3 setting in FrameMaker do not appear in my help output.

What am I missing?