There is no progress indicator for population nowhere, and yet it grows. The "zzz" on paused buildings means only transportation to storehouse will not begin until unpause the building. In certain case the production time begins by unpause, otherwise the transportation. This works like this over more then on year, so if it were thought by devs to an exploitation, they have had enough time to fix it. Anyway, if stop a building when settler is on the way, he will not sleep on the road or in the storehouse, so I think it is a consistent behavior: the pausing point is the begining or ending point of production phase.