Upgrading a project with Universal RP 6.9 does not upgrade Universal RP to 7.0

1. Create a project with Universal RP 6.9 in 2019.2 or older version
2. Open the project in Unity 2019.3 or a newer version

Expected result: Unity upgrades with no errors, upgrading the project version of Universal RP if required
Actual result: Reference problems which get cleared after upgrading Universal RP to 7.0

Note: Upgrading the package in Package Manager manually clears the errors.

Reproduced with: Creating the initial project on 2019.2.4f1 and upgrading to both 2019.3.0b1 and 2020.1.0a3 separately.

Erorrs: Library\PackageCache\com.unity.render-pipelines.lightweight@6.9.1\Runtime\2D\PixelPerfectCamera.cs(179,13): error CS0234: The type or namespace name 'PixelPerfectRendering' does not exist in the namespace 'UnityEngine.Experimental.U2D' (are you missing an assembly reference?)

Library\PackageCache\com.unity.render-pipelines.lightweight@6.9.1\Runtime\2D\PixelPerfectCamera.cs(185,17): error CS0234: The type or namespace name 'PixelPerfectRendering' does not exist in the namespace 'UnityEngine.Experimental.U2D' (are you missing an assembly reference?)

Library\PackageCache\com.unity.render-pipelines.lightweight@6.9.1\Runtime\LightweightRenderPipeline.cs(135,46): error CS0122: 'VFXManager' is inaccessible due to its protection level