Force new login when fingerprint changes
So I noticed that when a new biometric login is added to an android device, Proton pass does not force a new login. This means that the devices master password/pin/pattern acts as a masterpassword to Proton apps (not only pass) and all the data within them. This is not the case in some competitors products (for instance nord pass) which forces an entirely new login flow for its account when the biometrics on the device change. It also begs the question why Proton pass even bothers to give you the option to force biometric authentication for unlock (rather than pin etc) when said pin can be used to register new biometrics on the device without Proton detecting it.
From a security perspective, I see this as quite a big weakness of Proton compared to Nord.