Observed this happening for dozens of links on https://en.wikipedia.org/wiki/Barack_Obama
Minimal test case: create a page with [["Foo bar"]] {{echo|[["Bar baz"]]}}. Load the page in VE while watching the network tab in the web inspector, filtering for XHR requests. Observe an API request is sent for %22Bar_baz%22 but not for %22Foo_bar%22 or "Foo_bar" or anything else.