## Summary
Fixes: https://github.com/facebook/react/issues/27296
On actions that cause a component to change its signature, and therefore
to remount, the `_debugSource` property of the fiber updates in delay
and causes the `devtools` source field to vanish.
This issue happens in
https://github.com/facebook/react/blob/main/packages/react-reconciler/src/ReactFiberBeginWork.js
```js
function beginWork(
current: Fiber | null,
workInProgress: Fiber,
renderLanes: Lanes,
): Fiber | null {
if (__DEV__) {
if (workInProgress._debugNeedsRemount && current !== null) {
// This will restart the begin phase with a new fiber.
return remountFiber(
current,
workInProgress,
createFiberFromTypeAndProps(
workInProgress.type,
workInProgress.key,
workInProgress.pendingProps,
workInProgress._debugOwner || null,
workInProgress.mode,
workInProgress.lanes,
),
);
}
}
// ...
```
`remountFiber` uses the 3rd parameter as the new fiber
(`createFiberFromTypeAndProps(...)`), but this parameter doesn’t contain
a `_debugSource`.
## How did you test this change?
Tested by monkey patching
`./node_modules/react-dom/cjs/react-dom.development.js`:
<img width="1749" alt="image"
src="https://github.com/facebook/react/assets/75563024/ccaf7fab-4cc9-4c05-a48b-64db6f55dc23">
https://github.com/facebook/react/assets/75563024/0650ae5c-b277-44d1-acbb-a08d98bd38e0
eaa696876e