[DevTools Bug]: TypeError: ie.handlePostCommitFiberRoot is not a function

### Website or app https://codesandbox.io/s/goofy-bas-n5djr8 ### Repro steps I believe this is a bug when using React DevTools v4.x.x (not 5.x.x) with `react-dom@19.0.0-canary-xxx`. It currently errors in embeded code sandbox (which embeds v4 of DevTools) but not when you open in a new tab (I have DevTools 5.xx installed). To repo, create an error boundary, and throw an error inside it using the 19 canary and v4 of DevTools. Or, see the sandbox link above and: 1. View sandbox 2. Click "throw error" 3. Observe "handlePostCommitFiberRoot is not a function" in console ### How often does this bug happen? Every time ### DevTools package (automated) embeded code sandbox version ### DevTools version (automated) 4.4.0-f749045a5 ### Error message (automated) handlePostCommitFiberRoot is not a function ### Error call stack (automated) _No response_ ### Error component stack (automated) _No response_ ### GitHub query string (automated) _No response_