While using the Team Apps, I noticed that when you use the filter to locate a Team, you will only be able to see the General channel and not all the other non-hidden channels as expected.
Clicking on the Team in the returned list of Teams also does not bring me into the context of the Team while the filter is still on. I have to clear the filter at this point by clicking the X, and then I'll be brought into the context of the Teams and all the other channels appear. This assumes that the Team is not in the Hidden Teams list.
If the Team is in the Hidden teams list, nothing will appear as the team is hidden. You have to unhide the Hidden Teams before the Team and its context appear.