Proton
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Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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Just a wild guess, but does it use your system keyring for credential storage?
On Plasma, usually Kwallet provides the XDG secrets service, which is a generic interface for applications to store and retrieve credentials. However, applications in auto-start may query this service before it's up. If they're well written, they may retry, request the service to start, or at least work after restarting the app. If they are less well written, they may immediately reset and ask for credentials again.
See https://wiki.archlinux.org/title/KDE_Wallet#Automatic_D-Bus_activation
Rest of the article may also be worth a read
$ dpkg-deb -I proton-pass_1.32.6_amd64.deb|grep -E "key|xts|sec"
I have been starting Pass manually couple of minutes after booting, so this should not be the problem. I do not know why, but now several times Pass remembered my settings. I suspect that I have used password for the 1st time to login Pass app, before I remember only scanning a QR code from my other device.