Most important thing need to keep in mind while using Coroutine is that, Coroutine is affected by Timescale.
When time scale is reduces to 0 then Coroutine won't be called. This is the different behavior then MonoBehaviour Update() call which is still getting invoked even after Timescale reduced to 0.
When time scale is reduces to 0 then Coroutine won't be called. This is the different behavior then MonoBehaviour Update() call which is still getting invoked even after Timescale reduced to 0.
More notes about Time.timeScale,
