Map exploration progress reset on log out

I'm already aware of instances reseting after not being used for 8-15 mins. However, I have found some inconsistencies when logging in after logging out (inside of an instance, halfway through) for a break (lunch, sleep, …). Sometimes when I log in:

1) Turns out the instance was preserved, and all exploration progress is unaffected. Fog of war is as left during log off, all cleared enemies are still dead if I backtrack.
2) I find myself in the waypoint, and all exploration progress has been reseted (map is again full of fog of war, checkpoints are unavailable, enemies are reseted).
3) I spawn at the latest checkpoint used. All fog of war is reset, but all checkpoints unlocked are still available. I can tp between them, even if I can not see them on the map.

For reference, I always exit the game the same way: Esc. (Game paused menu) > Exit to desktop

I have tried reinstalling the game, which solved some similar problems found in other posts, but it still keeps happening to me.

At this point I'd just like to know what would be the intended behaviour while they work on fixing the unintnended ones. I'm honestly hoping the intended behaviour is #1, especially considering how maps just keep getting bigger and bigger with each campaing act yo go through.