Asset Manager settings that worked in 4.26 now have extra invisible broken types

For 4.27/5.0 (as part of [Link Removed]) we changed the asset manager's settings to be a key-indexed config array which gives more safety with removing entries via the UI. However, this actually broke many licensees because it causes the "!PrimaryAssetTypesToScan=ClearArray" line (which is used in our samples and documentation) to fail, leaving the array in a broken state. The ! syntax appears to only half work with key-indexed config arrays

The desired behavior is that line should delete all entries in the PrimaryAssetTypesToScan array. However, what happens in 5.0/4.27 is that it still loads the old values from BaseGame.ini, but doesn't show them in the project settings UI. So you end up with invisible engine-defined types that break any game-specific types that could conflict. You can work around this by using the in-game project settings UI to save the updated list, but it is broken for licensees until you do this.

1. Download attached project and unzip
2. Launch UE4 or UE5 editor with MyProject specified as the project
3. Look in the log for error message "LogAssetManager: Display: Ignoring PrimaryAssetType Level - Conflicts with Map - Asset: NewWorld"
4. Open up Project settings and go to Asset Manager and look in Primary Asset Types to Scan. Notice that the Map type is not listed. Map is in a weird half loaded state

The correct behavior is that the Map type should not exist at all and there should be no warning message. The engine's built in Map type is conflicting with the game's desired Level type