Same issue here with beehaw PWA created by chrome. I deleted and reinstalled the PWA but the issue remains. If I close the PWA it logs me out.
My lemmy.world PWA is doing the same thing, so it's not just beehaw.
I've been using the voyager web app too and it stays logged in.
The Beehaw PWA behaves as if it's fullscreened like a video, hiding the controls. The other Lemmy PWA doesn't do that. PWAs are cool, but theres NO user side settings. Everything seems to be server side.
The phone is a Moto G Power 5G on android 13.
So when using the Beehaw PWA created by Chrome or Firefox the nav buttons at the bottom of the screen are hidden, requiring swiping up from the bottom of the screen every time I want to hit the back button.
I'm also using another Lemmy PWA for another instance and that one works as expected, with the bottom buttons staying on the screen. I believe the Beehaw PWA is in fullscreen and the other isn't.