Seen this happen a few times. Refreshing the simulator always fixes it.
Hmm. I think it always happens when Chrome debugging is on. We just didn't notice before.
React DevTools has been rewritten and recently launched a new version 4 UI. The source code for this rewrite was done in a separate repository and now lives in the main React repo (github.com/facebook/react).
Because version 4 was a total rewrite, and all issues in this repository are related to the old version 3 of the extension, I am closing all issues in this repository. If you can still reproduce this issue, or believe this feature request is still relevant, please open a new issue in the React repo: https://github.com/facebook/react/issues/new?labels=Component:%20Developer%20Tools
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Hmm. I think it always happens when Chrome debugging is on. We just didn't notice before.