Talk:Lantern/@comment-2A02:C7F:9661:A200:4892:4256:A5F7:261E-20190224191530

"Exiting and restarting a world will "freeze" the state of any placed Lantern in that world until a player interacts with it. This means that any Lantern turned on can last indefinitely."

This no longer happens with ROG + Hamlet compatibility nor DST. I haven't tried other flavours of the game. It may still work for them.