@emil, We had a pretty good rain this week on 9/15. However, my flex scheduled grapes ran as scheduled a day and half later. There is 0 precipitation recorded in any of the moisture graphs.
Here is the weather station data from the link provided by the Rachio app:
I manually stopped that half way through the schedule and also turned off my other Fixed schedules, but they all ran at least partially when they really should have delayed.
Let me know if you need anything else.