IIRC, HMR in webpack has an issue when you add/remove/possibly reorder imports in JS; the imports are cached in memory by their index (or something like this), so when you remove a fifth import, suddenly the previously-sixth import statement will refer to the wrong module after HMR.

Took me a good while to understand the issue is with HMR and not my code. I restart the dev server many times a day just to be sure or when things inevitably explode.