Item observed: Event Maple Tree pass Issue: I was able to use it despite being expired. Steps performed: Logged in, spawn on tree map portal and instantly went in, pass expired when I already was inside of the map. Expiry date was few hours beforehand. Reproduceable? Haven't tried yet so info is N/A.
There seems to be a few second gap between spawning and the game checking if you have expired items. A fast character (NL with Flash Jump) could conceivably make it into the portal before the item expires. I was able to reproduce the error and had a character get into the map portal before it expired. It's not items being 'inconsistent' it's that there's a delay between login and the game checking for expired items.