Looks like there's a problem with the "HTTP agent" item. I have several templates with the "HTTP agent" data item type. And everything works fine if I just link this template to any host, but if this template is linked to host prototypes from detection, "HTTP agent" item goes into unsupported state, with message: Invalid query fields

If you enter the item, you can see that the field is not full

But in the template, this field is set. And if I just click on the update of this item in the template, then in the host it too will be updated and will be full. 

But this will have to be repeated for each newly discovered host...