The data from `WORLD_PATHS_JSON` is supposed to be constant logic data
shared by all Landstalker worlds, but `add_path_requirements()` was
modifying this data such that after adding a `Lantern` requirement for a
dark region, subsequent Landstalker worlds to have their logic set could
also be affected by this `Lantern` requirement and previous Landstalker
worlds without damage boosting logic could also be affected by this
`Lantern` requirement because they could all be using the same list
instances. This issue would only occur for paths that have
`"requiredItems"` because all paths without required items would create
a new empty list, avoiding the problem.
The items in `data["itemsPlacedWhenCrossing"]` were also getting added
once for each Landstalker player, but there are no paths that have both
`"itemsPlacedWhenCrossing"` and `"requiredItems"`, so all such cases
would start from a new empty list of required items and avoid modifying
`WORLD_PATHS_JSON`.
Mysteryem
Dinopony