Yeah I checked. Looks like I have to do an extra press to get to the lock screen then the double press for camera. This wasn't the case on previous models.I can't say about the AOD because I don't use it but as for the double click to turn the camera on from lock screen (screen off) it works fine for me, maybe it's a setting somewhere in lock screen or AOD settings.
I restarted my device and it's fixed now.I use aod on a time schedule. But I just tried it with aod on and off, and double click launches the cameras every time. I've disabled Bixby and use it for the normal power menu, not sure if that's why