WhatsApp testing a new version of reactions.
WhatsApp released a new version of the reactions feature; Which means now you can react with any of the emojis you want.
As shown above, users can now react with various other emojis than the original six emojis by tapping the plus [+] icon.
The previous update was on changing the skin colour of the emojis of reactions and now WhatsApp took it even further, by adding this feature. Currently, WhatsApp beta for Android 2.22.15.6 and 2.22.15.7 and WhatsApp beta for iOS 22.14.0.71 are marked as compatible updates.