Reproduction steps:
1. Open the attached project ("case_1241309-BundleDependencies.zip")
2. Open the repro scene ("SampleScene")
3. Build Player Content
4. Enter Play Mode
5. Click the "Load" button on the top left corner of the screen
6. Wait for the prefab to be loaded and instantiated
7. Click the "Release" button and wait until the prefab is unloaded
8. Click the "Load" button again

Expected result: Prefab is loaded with the same texture
Actual result: Loaded prefab is missing the texture

Reproducible with: 2018.4.23f1, 2019.3.14f1, 2020.1.0b9, 2020.2.0a12
Reproducible with package versions: 1.1.5, 1.8.3

Notes:
1. The issue only reproduces when using real bundles and "Use Existing Build" Play Mode Script
2. The issue does not reproduce when the texture is in the same bundle as the prefab
3. The issue also reproduces on builds (tested on Standalone x64 Windows10 build)