We have to remember the techie people here, are techie people and not writers. They may not know literary jargon, so you may need to clarify what I write below to make sure they understand fully.

I did a few tests see 1.tests.spacing test (I see what you mean). When there is supposed to be a space at the start of the sentence WC doesn't show it, but for some reason after a double return sentences start with a space.