Just tested it. Firmware update Did not fix my issue.
I am having the same problem as well. I have smart watering turned OFF. I have no external rain sensor. However the control keeps missing my watering schedule due to rain delay. I can see the rain delay on my app and cannot get rid of it. Did I mention that I have the SMART WATERING turned off. The irony of it all is that we live in California and have had no rain in a month now. PLEASE Help my beautiful garden is dying.