We've recently added COinS metadata to our website to support better integration with reference managers. An example of a page with the metadata in it is here: https://www.lens.org/lens/scholar/search/results. This part of our site is written like a single page application, so the Mendeley Web Importer doesn't detect the COinS elements. It does pick up the DOIs, but any results without DOIs aren't detected by the Mendeley Web Importer. We're dispatching events to the Zotero Connector so that it works well on these pages, but I can't find any equivalent function for the Mendeley Web Importer. Is there any way to trigger the Mendeley Web Importer to check the page again for COinS?
For books only (i.e. rft_val_fmt=info:ofi/fmt:kev:mtx:book), could you try setting the title on the rft.btitle parameter instead of rft.title please?
The Mendeley Web Importer only supports the following formats at the moment:
I can see at least one format in your page that will be ignored by the Mendeley Web Importer: