In order to get the Asset Publisher work in fragments, we have limited the usage of the option Set as the Default Asset Publisher for This Page (
We require changes in the asset publisher documentation, only for 7.1. We need to specify that this option only is available in Widget pages, as an alternative you can use Display Pages itself if you need to use fragments in a display page:
Set as the Default Asset Publisher for This Page: The Asset Publisher app is an instanceable app: multiple Asset Publishers can be added to a page and each has an independent configuration. The default Asset Publisher for a page is the one used to display web content associated with the page.
Also, create a new article in the Knowledge base of the Help center explaining this restriction in the 7.1 version, and let the customers know that in 7.2 this will be available.