How to reproduce:
1. Open attached project "Edited.zip"
2. Run the menu item: Test -> Old Style Build
3. Run the menu item: Test -> New Style Build
4. Open AssetBundles_OldStyleBuild/AssetBundles_OldStyleBuild.manifest file in a text editor to see how a manifest file should look
5. Compare AssetBundles_NewStyleBuild/AssetBundles_NewStyleBuild.manifest file to the previously formed one

Expected result: All the dependencies are being proceeded by a line containing "Dependencies:"
Actual result: All the dependencies are on the same line on(i.e line 8 in the attached picture) instead of being on a separate line each

Reproducible with: 2018.4.3f1, 2019.1.8f1, 2019.2.0b8, 2019.3.0a8

Couldn't test reliably on 2017.4 dues to the namespace errors:
Assets/Editor/BuildScript.cs(2,19): error CS0234: The type or namespace name `Build' does not exist in the namespace `UnityEngine'. Are you missing an assembly reference?
Assets/Editor/BuildScript.cs(2,19): error CS0234: The type or namespace name `Build' does not exist in the namespace `UnityEngine'. Are you missing an assembly reference?