When picking up work on #1765 (www) today I merged the current master. After that I started noticing that in gatsby develop whenever I changed a layout, template or page, HMR stopped working (until I reload the page). Console says Warning: You cannot change <Router history>:

I can reproduce this in www of the current master, too (Gatsby v1.9.10). Also tried v1.9.14 and run into the same. Searched and found #1913 and #1936 … confused now! ;-) ¯\_(ツ)_/¯
Seems I'm not the only one seeing this. @3axap4eHko not sure if this is related to your PR, but maybe you can take a look?
I am also having the same issue.
+1
@KyleAMathews Thank you! 🎉
Sorry for the slow fix here — gatsby 1.9.31 has the fix from https://github.com/gatsbyjs/gatsby/pull/2110
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I am also having the same issue.