I tried unlocking the device by Find My Mobile service, it was supposed to delete the lockscreen password, as well as Biometrics, I was able to access my phone. I thought problem is resolved and tried registering biometrics again, but it asked the password again. Now I thought restarting might fix this, but again, after restart, I'm stuck on lockscreen, and it doesn't accept any password. And I don't want to reset the phone, it has important data.
IF SOMEONE FINDS SOLUTION TO THIS, PLEASE COMMENT THE SOLUTION. (NO SUGGESTIONS FOR RESETTING THE DEVICE, PLEASE)
Yeah man, I had this in my mind. Do you have any way to take backup of locked phone? I'll reset the phone if I'm able to take backup of some folders (like WhatsApp & DCIM).
Lastly I had to reset the device, and I lost all the data. I talked to one of my relative in service station and he told the same.
I'll take this as opportunity cost of being in Beta Program. And yeah, when I got access to my device once, I sent report from Samsung Members, I hope it'll help the developers.