According to the website WABetaInformationversion 2.22.8.11 WhatsApp Beta for Android introduced a way to quickly start a conversation with numbers not saved in the phone’s phone book.
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With the new version of WhatsApp Beta for Android available as part of the Google Play Beta Program, clicking on an unsaved number in a chat bubble now opens a dialog box with options to start a chat with a person if they have a WhatsApp account. , add the number to your contacts, or start dialing.
This is a big change from WhatsApp stable as tapping on an unsaved number will bring up the option to open the Android dialer app. It is not yet known when the novelty will be available to all users of WhatsApp for Android.

Play/WABetaInfo
WhatApp betas are constantly updated with new features and functions before they are made available to the general public in the stable version of the app. iOS app beta recently received support upload files up to 2 GB in some regions, and the Android Beta received message response supportFor example.
Users interested in testing new features of the WhatsApp for Android beta should sign up for the Google Play beta program. To do this, you need to access this link and click on the “BECOME A TESTER” button to register. An important detail of the program is that the number of places is limited, so not everyone who clicks on the link will see the opportunity to register. Click on the link often to find out if there are new vacancies. Another point is that beta versions of WhatsApp can be unstable and therefore not recommended for all users of the app.
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Via: Android Authority Source: WABetaInfo