I was able to fix it in my console by adding the file to my Framework Ignore List in Chrome.
Steps:
Console -> Gear icon (top right) -> Settings -> Framework Ignore List.
Add react_devtools_backend.js
to the list and the console.log
should start showing the correct mapping again.
![screenshot of Framework Ignore List in Chrome Settings](https://i.stack.imgur.com/Yps5e.png)