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[Asset Bundles] Font assets are included in every AssetBundle that references them

Asset Bundles


Reproduction steps:
1. Open user's attached project
2. There is a Font in a project (Assets/Fonts)
3. The Font is referenced by some Scenes and a Prefab
4. Build the project for any Platform
5. This will execute "Builder.cs" Script and build Asset Bundles
6. Go to AssetBundles in the root directory of the project
7. Inspect the created Asset Bundles by checking their size (files with the Font will be 10MB+)

Expected result: Font file will only be included in project_fonts Asset Bundle
Actual result: all Scene and Prefab Asset Bundles that reference the Font have it included in them (scene_a, scene_b, prefab_c)

Reproducible with: 2017.4.38f1, 2018.4.19f1, 2019.3.6f1, 2020.1.0b2, 2020.2.0a4

  1. Resolution Note:

    User build code is set up to build each bundle independently from each other. Thus each bundle will not know about the setup of other bundles and will pull in all dependencies. To fix the build code, update the code to construct the AssetBundleBuild containing all asset bundles and assets necessary and pass the entire array into the BuildAssetBundles api, or use the BuildAssetBundles api that does not take an AssetBundleBuild array, and the data will be pulled from the Asset Database fields.

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