I haven’t seen this before. I typed in {{source.url}}, and normally that’s respected in the field, but for some reason, not this time.
Ah.
However, in this test file I’m working on I’ve found an interesting bug. Basically, I duplicated the Blog/Post pages in Microblog and renamed them Lenses/Lens to try something out. I then populated the settings correctly for Collection/Item/Folder/Page. However, the Search component is swapping out. I type in Posts (folder) and Post (page) for the Blog page search component, and Lenses (folder) and Lens (page) for the Lenses page search component. I then run preview, and when I click on a Blog post I get…a lens MD file, not the blog post, AND then collection for the Search element changes!
I’ll upload the test project in a moment.
The Search Component is part of a Global header on the site. You’d need to move it out of that or unlink it from the Global.