I think this was caused by one of the recent releases, because this has only started happening today

The diffs are now completely unreadable:

The chart tab just dies with "error":

And that "Array of tuples" change from here in remotedev-serialize made it a nightmare trying to navigate through just a normal Map & List Immutable state. It's even worse than the similar Array-crazy pain that the React Dev tools inflicts upon us.

I mean look at this, it's a huge headache:

The distinction between List and Map data has been blurred horribly to the point that I can barely tell where I am in the tree anymore.

Compare with this extremely readable layout from immutable-object-formatter-extension (powered by immutable-devtools)