Decode a baked cluster asset to a flat PackedClusterData, dispatching on the format version: v2 → as-is, v3 (paged) → loaded and flattened (so the v2 renderer consumes it unchanged).
Decode a baked cluster asset to a flat PackedClusterData, dispatching on the format version: v2 → as-is, v3 (paged) → loaded and flattened (so the v2 renderer consumes it unchanged).