WhatsApp is working to improve fingerprint authentication on Android devices and is testing the possibility of limiting screen captures of conversations protected by this security measure.
In other words, if you use a fingerprint to block the WhatsApp conversation, you will not be able to take screenshots. Technology portal Wabetainfo says.
I do not currently know why WhatsApp decided to avoid the screenshots of the conversation when using fingerprints. However, it will be an additional measure to protect the private nature of the dialogue stated in Gestión.pe.
This feature is temporarily available in WhatsApp Beta 2.19.106 for Android, according to Wabetainfo.