GuildExtraSaveDataMap.Value.Expedition.RawData (post-2026.7 saves) breaks parsers that keep guild-map decoding enabled

[homuraLan]

Issue draft: GuildExtraSaveDataMap.Value.Expedition.RawData breaks parsers that keep guild-map parsing enabled

Repo: EternalWraith/PalEdit
Title: GuildExtraSaveDataMap.Value.Expedition.RawData (post-2026.7 saves) breaks third-party parsers that keep guild-map decoding enabled

Summary

After the Palworld update in late July 2026, Level.sav saves gained a new
field inside each GuildExtraSaveDataMap entry: Expedition (with an
Expedition.RawData ArrayProperty payload).

PalEdit's MAIN_SKIP_PROPERTIES skips the entire
.worldSaveData.GuildExtraSaveDataMap as an opaque blob, so this never
surfaces in PalEdit itself. However, third-party tools that need to decode
guild chest data (e.g. server-side guild-chest capacity mods that read
GuildItemStorage.RawData → container_id) keep the guild map enabled and
crash while decoding the new Expedition.RawData field:

UnicodeDecodeError / Exception: Error decoding utf-16-le string of length ...

Root cause

Expedition.RawData is an ArrayProperty whose element structs are not
covered by the vendored palworld_save_tools custom-property decoders
(guild_item_storage.decode / guild_lab.decode handle GuildItemStorage
and Lab but not Expedition), so the generic decoder walks into unknown
nested structs and misaligns the byte cursor.

Suggested fix

Add a custom-property entry so downstream consumers can skip just the
Expedition blob while still decoding the rest of the guild map:

".worldSaveData.GuildExtraSaveDataMap.Value.Expedition.RawData": (
    skip_decode,
    skip_encode,
),

Using a skip_decode/skip_encode pair (read header metadata + raw payload,
write back verbatim) round-trips byte-identically and keeps
GuildItemStorage/Lab/container_id decoding intact. Verified locally:
save parses, all guild chest entries report correct SlotNum, and the save
re-serializes without the skipped field being modified.

Additional note

The same drift guard applies to other post-2026.7 top-level fields
(OilrigSaveData, SupplySaveData, RandomizerSaveData,
InvaderDeclarationSaveData, FixedWeaponDestroySaveData) — a documented
"skip list for fields added after the parser freeze" would help any tool that
mirrors PalEdit's MAIN_SKIP_PROPERTIES approach while keeping selective
decoding enabled.