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### Which website or app were you using when the bug happened?

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### What were you doing on the website or app when the bug happened?

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### Generated information

DevTools version: 4.13.1-93782cfed2

Call stack:
(none)

Component stack:
(none)

GitHub URL search query:
https://api.github.com/search/issues?q=Cannot%20add%20node%20%20because%20a%20node%20with%20that%20id%20is%20already%20in%20the%20Store.%20in%3Atitle%20is%3Aissue%20is%3Aopen%20is%3Apublic%20label%3A%22Component%3A%20Developer%20Tools%22%20repo%3Afacebook%2Freact
pendingRealUnmountedIDs.push(id);
      }
    }
    if (!fiber._debugNeedsRemount) {
      untrackFiberID(fiber);
      const isProfilingSupported = fiber.hasOwnProperty('treeBaseDuration');
      if (isProfilingSupported) {
        idToRootMap.delete(id);
        idToTreeBaseDurationMap.delete(id);
      }
    }
  }
  function mountFiberRecursively(
    firstChild: Fiber,
    parentFiber: Fiber | null,
    traverseSiblings: boolean,
    traceNearestHostComponentUpdate: boolean,
  ) {
     Iterate over siblings rather than recursing.
     This reduces the chance of stack overflow for wide trees (e.g. lists with many items).
    let fiber: Fiber | null = firstChild;
    while (fiber !== null) {
      if (__DEBUG__) {
        debug('mountFiberRecursively()', fiber, parentFiber);
      }
       If 
       Als
      const mightSiblingsBeOnTrackedPath = updateTrackedPathStateBeforeMount(
        fiber,
      );