Changing a password on a single Proton service (e.g., Proton VPN) can unexpectedly change the password for all connected Proton services, including Proton Mail and Proton Pass. This can lead to users being locked out of their accounts, especially if they have not set up a recovery method.

This is particularly confusing when using an alias. A user might assume the password change only affects the specific service tied to that alias, not the entire Proton account. I experienced this firsthand; I was lucky enough to get all my data back after a reset.