Guild Wars 2

I did some testing and discovered that when changing zones or logging in, but before engaging in combat, my warrior is able to generate and keep Adrenaline using skills.

Once the first combat is over it functions normally until zone is changed or character is re-logged.

I have observed the same thing.

Not something particularly game breaking, but just a bit weird. At first I thought they had reverted the adrenaline changes, but it went back to normal after the first combat ended.

IIRC, the initial state even had no adrenaline decay whatsoever, so I could just run around with adrenaline forever so long as I didn’t get into combat.