I have had the same problem since yesterday. The kitchen and living room heat is turned up at a certain time, depending on whether it is a weekday or not, and given that anyone is home.
This is a Homey (Early 2019) with fw version 4.2.0.
Time zone and time are both correct
No changes have been made to the flows for a few weeks (since replacing a heater + switch with a wifi heater), and they have worked fine since creation. Our phones were turned on at the time. I have added logging for presence at the same time tomorrow to see if that is the problem, but I see @Renzo does not use location in the flow, so maybe that’s not it.