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…to avoid re-evaulation right before destroying. With `DeferredTrackedSet` we delay both adding and removing elements from the set. That means when you're transitioning between routes, and breadcrumbs change, both old and new breadcrumbs are rendered (briefly, in a first render pass) And since the arguments for the old breadcrumbs can be (and often are) destroyed - it would blow up the renderer. By caching the template it will reuse it in that first pass. --- No test because I couldn't figure out a synthetic test setup where you have breadcrumbs in a deeply nested route and where you navigate from that route to one of the parent routes.