I reset my game at about 00:05 UTC specifically to unexhaust the adventure and do LF again. I got no LF, and after completing the adventure it doesn't even show as exhausted.
Wouldn't really look unusual. I did the adventure a second time and got LF as normal, for what it's worth.
This happened to me yesterday. Did you reset while in a co-op group that had already 'gone to' the adventure? That's what caused it in my case.
I'll mark this as resolved then? Or possibly needs ingame clarification - it's a very specific case either way.