In the Reconciliation sub-chapter of the DLC chapter (Farewell), there are two refill diamonds (one single diamond, one double diamond) hovering at the top of the screen. As far as I can tell, these serve no purpose. It's very difficult to reach them, and the bird throws you right past them.
Given the presence of multiple hidden branching paths in this level, I'm suspicious. Are these really just superfluous diamonds, uncharacteristically forgotten by the developer, or are they significant?