Tested with OCCI platform extension.
Open both the extension and a configuration diagrams in clouddesigner.
Create 2 resources, then a link btw them in the configuration, with the kind "componentlink" (from OCCI platform extension).
Now delete the newly created link (edit/cut).
The "componentlink" definition disappears as well from the extension diagram (!)
So, deleting a link in a configuration deletes its definition in the extension.