Installed the latest A50 update. Can confirm fingerprint recognition is better now. People getting "Make sure the fingerprint sensor is clean and dry, then try again" error need to do the obvious thing - clean and dry your fingers and the fingerprint sensor and try again.
I faced the same issue initially. Then I took a soft cloth, cleaned the finger and the sensor, and placed my finger to register it. I did this after every single tap. It's a lengthy process, but worked.