2d Animation, 2d IK, 2d Pixel perfect, 2d Spriteshape, 2d psd importer packages throw missing namespace errors on installing even when all the dependencies have been installed.

Steps to reproduce:
1) Create new project.
2) Window > Package Manager.
3) Install 2d Animation.

Actual result: Missing namespace are thrown in console.
Expected result: No errors in console.

Reproducibe in: 2019.2.0a10, 2019.2.0a9, 2019.2.0a8, 2019.2.0a7.
Working fine in: 2019.2.0a6.

Environment: Both Windows and Mac.

Stack trace:
1) Library\PackageCache\com.unity.2d.common@1.1.0-preview.1\Editor\ImagePacker\ImagePackerDebugEditor.cs(28,9): error CS0246: The type or namespace name 'SpriteRect' could not be found (are you missing a using directive or an assembly reference?)

2) Library\PackageCache\com.unity.2d.common@1.1.0-preview.1\Editor\InternalBridge\InternalEditorBridge.cs(33,23): error CS0246: The type or namespace name 'ISpriteEditorDataProvider' could not be found (are you missing a using directive or an assembly reference?)

3)Library\PackageCache\com.unity.2d.common@1.1.0-preview.1\Editor\InternalBridge\InternalEditorBridge.cs(64,50): error CS0246: The type or namespace name 'ISpriteEditor' could not be found (are you missing a using directive or an assembly reference?)