How to reproduce:
1. Create a new Unity project
2. Create a Scene with many references to external Scriptable Objects, which have references to many Textures
3. Assign the Scene to one AssetBundle, and Scriptable Objects to a variety of other AssetBundles
4. Build the first AssetBundle which has the Scene

Expected result: while the AssetBundle with the Scene is being built, Textures are not loaded
Actual result: during building, the Scene Asset is loaded along with all of its dependencies, causing a big memory load

Reproduced on: 2019.2.9f1 (HDRP 6.9.1-preview)

Note: the cause of the large memory load is due to poor code logic in HDRP.