Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When the state or props are formed by Immutable.js objects, react devtools cannot expand it nor copy to temporal variable anymore.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to your JSFiddle (https://jsfiddle.net/Luktwrdm/) or CodeSandbox (https://codesandbox.io/s/new) example below:

https://codesandbox.io/s/withered-cherry-h3dfh

What is the expected behavior?
Be able to inspect the value of the immutable object or at least, copy it into a temporal variable.

Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?
React 16.8.6
Chrome Version 70.0.3538.77 (Official Build) (64-bit)