Leoth I set an alarm in the safe mode, and the same problem is occurring in that mode as well. The alarm rings, I dismiss it, the phone vibrates in the alarm’s rhythm for a few seconds. After that the vibration haptic stops completely for everything on the phone.
I contacted Nothing support, they have asked me to perform 3-4 things that would help me resolve the issue according to them, and also suggested a factory reset as a last resort. So far all their solutions have not worked. Will try clearing cache and if that doesn’t work then will have to factory reset.