As in the subject line: when clicking the back button or the X button on a POI, I get logged out. Logging back in can sometimes be instant, at other times weirdly finicky. In the screen recording below, the latter was the case. Excuse the poor resolution, had to compress to be able to upload here.
This only seems to happen on Safari given the login on Orion and Chrome is embedded deeper in the browser and extension functionality respectively. It also doesn't seem to happen for every POI, but I haven't been able to discern a pattern on this yet.
For reference, I have not tested this behaviour on Safari on iOS, or any other browser on iOS.