Though I would agree with you about problems with tiles and the "new day" start,where things remain or dont show up.
I dont know how you can even attack someone on a tile that isnt there.It must be there for someone to be on it.
Have you recorded what kind of lair it is and if its from a "times up" incursion.
Silly questiion really, because if you are not seeing it on the watch tower and attacking occupied tiles from the global map then you wont know..
Do you play via the Plarium.com on a PC ?
Its pretty obvious that some players, who must be using a different system,"see" things much sooner,even immediately.
I have seen players attacking things I cannot see before,and players scoring in events where it should be impossible to do so,given what I can see available .
Sometimes after reloading the game,it will show what is actually there,but mostly I have to wait hours for new stuff to be available.