URL doesn't always contain the state hash in WC

[fbarl]

To reproduce:

1. Go to e.g. Monitor
2. Click on Explore
3. Observe that the URL hash reflects the state loaded from localStorage: https://frontend.dev.weave.works/app/proud-wind-05#!/state/{"controlPipe":null...
4. Click again on Monitor
5. Click back on Explore
6. The URL doesn't contain the state hash anymore even though it loads exactly the same state as in 3.

The URL gets updated when the state is changed next time, but the problem persists every time when navigating back to Explore in WC.