Since I upgraded to Home v5 (I am not sure if it started to happen at the time of the upgrade or after updates within v5) I have observed that when a flow fails to switch a device on/off or even if I switch it manually while the device unplugged still appears as if no error happened and the switch had really changed the state.
As an example, I unplugged a few days ago 2 switches of different brands (different APPs so I assume the issue is not linked to specific APP) but when a flow tells a switch to switch on/off it still appears as if the switch had really switch on/off, something that it is not possible since the switch is unplugged.
Before the upgrade to v5, when there was an error the device changed the state back after few seconds but now it doesn’t happen. I have observed it in several cases, especially when I unplug a switch. It is true that due to better stability of Homey comparing with v4.2 I have not seen “real errors” with the device plugged (they might still happen rarely but due to the current behavior I could have missed it).
Before opening a ticket in Homey support I would like to know if someone else is facing the same issue.