Generation of Assets lists&AssetFilterSettings during packaging with ExternalActors enabled

[heal-afk]

Summary

When building the project for Windows with WorldPartition levels that use One File Per Actor (default), enabling AutoGenerateOnLevelSave causes the system to generate AssetList and AssetFilterSettings for every individual ExternalActor asset. These are then added to LevelPreloadDatabaseLPT, resulting in significantly increased build times and unnecessary asset proliferation.

Disabling AutoGenerateOnLevelSave resolves the issue.

Steps to Reproduce

1. Open a project using WorldPartition with ExternalActors (One File Per Actor enabled).
2. Enable AutoGenerateOnLevelSave in LevelProgressTracker settings.
3. Build/package the project for Windows.
4. Observe build time and generated assets in Content Browser.

Hypothesis

During packaging, Unreal Engine may load each ExternalActor as a separate "micro-level". If AutoGenerateOnLevelSave does not distinguish between main levels and partitioned sub-assets, it triggers generation for each one.