Ionic tabs navigation not working properly with nested tabs

I have nested tabs using Ionic, ie something like

- Tab 1
  - Nested view 1a
  - Nested view 1b
- Tab 2

And I'm trying to link from Tab 2 to Tab 1 with nested view 1b, but while the url changes the page doesn't change. Everything else works properly with the tabs.

Anyone know what the problem is?