Recently I noticed notifications on lock screen display all information as if phone was unlocked on owner profile .
This happens if I use a guest profile without a password and switch back to owner .
This hasn't happened in the past only in the past 2 updates .
Bug with guest and notifications
Skyway This isn't the case for me. You can make sure the setting is still set to what you want in Settings > Display > Lock screen > Privacy
and set to "Show sensitive content only when unlocked".
I think this should be a per-profile setting, but you can make sure the owner profile has the same setting.
When switching back to owner it displays the pin pad , I swipe down to get rid of pin pad and use biometric that's when I see the notifications .
Skyway I understand now. It sounds annoying, but I'd bet that this behavior is a result of an upstream bug (since, to my knowledge, GrapheneOS hasn't changed any related code). There are many bugs like this but they sometimes aren't fixed quickly or at all by upstream AOSP.
You could open an issue in the GrapheneOS issue tracker here, but I think it's unlikely that GrapheneOS developers will fix this issue since they're busy with other projects. Though, since it sounds like it's a new issue, maybe Google will notice a recent change on their end caused this bug and they may already be aware of it.