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Stacked on #31736. <img width="1223" alt="Screenshot 2024-12-11 at 8 21 12 PM" src="https://github.com/user-attachments/assets/a7cbc04b-c831-476b-aa2f-baddec9461c9" /> This emits a placeholder when we're deduping a component. This starts when the parent's self time ends, where we would've started rendering this component if it wasn't already started. The end time is when the actual render ends since the parent is also blocked by it.