In the second revision of my post I've added two links as list items and removed a sentence. The Markdown diff looks fine:
But the inline and two-column mode diffs look weird:
The first eight list items are not changed, but marked as different in these modes.
Here is one more ugly situation: https://ru.meta.stackoverflow.com/posts/1268/revisions (Revision 69). It looks like the ENTIRE post was modified, but it wasn't. Compare with Markdown mode.