Packed level actors and Level instances are sometimes not included in HLOD build on a World Partition Level

Context
World Partition - Hierarchical Level of Detail (HLOD) system uses custom HLOD Layers to organize large amounts of Static Mesh Actors and generate a single proxy mesh and Material.

Problem
The problem is that when trying to build HLODs in a World Partition Level that contains Packed Level Actors and/or Level Instances, it often fails to include them in the HLOD with a warning. The only workaround at the moment is to either build HLOD until it works, or not use Packed Level Actors / Level Instances. Ensuring the actors within the Packed Level Actor / Level Instance to the correct HLOD layer also has no effect.

1.) Download and open repro project provided by licensee uploaded in ticket
2.) Open World Partition Editor; Window > World Partition > World Partition Editor to have as an aide in observing the actors
3.) Start a HLOD build via Build > Build HLODs or the World Partition Commandlet - [Link Removed]
4.) In the outliner open folder HLOD > hlod_OpenWorld_mesh
Observe: Two HLOD actors are present, double clicking on them will zoom into the bags that were successfully built
Expected: Five HLOD actors to be present, two from the level instance, two from the static mesh actors, and one from the packed level actor
Note: If there are five HLOD actors present, run another HLOD build until there are two. Most of the time it will result in two HLOD actors

LogWorldPartition: Can't find class descriptor '/Game/Maps/LevelInstances/BPP_BagStack.BPP_BagStack_C' for loading '/Game/Maps/OpenWorld.OpenWorld:PersistentLevel.BPP_BagStack_C_UAID_3C7C3FF3602DEA5102_1294300222', using '/Script/Engine.Actor'
LogWorldPartition: Warning: Unknown actor base class `/Game/Maps/LevelInstances/BPP_BagStack.BPP_BagStack_C`: Actor: 'BPP_BagStack_C_UAID_3C7C3FF3602DEA5102_1294300222' (guid '5AAB1ABC415AE3BED0593582EFB3F9FB') from package '/Game/_ExternalActors_/Maps/OpenWorld/8/E3/UZXGE1FGMOGKSZH610XFBL'