Yes we have come across the same problem, occurring this morning.
We have found that OnReset is triggered within the components however global variables are not getting set in the code, even though "Access app scope" is switched on.
It looks like this is due to a new Authoring Version 3.23022.21 being pushed to our tenant which is a Preview release, whenever we open up a Canvas app in Edit mode it automatically applies this version?
If you roll back the Authoring Version of your canvas app to 3.23021.21 it works fine again for us, which is ok but not a great solution if you have to do this every time.
We are going to check with MS to see if there is a feature or something that needs to be switched on/off or it is just a bug.