To reproduce this:
- install the 2D Animation package
- Wait for the installation
- notice the Burst Compiler erros:
Library\PackageCache\com.unity.burst@1.0.2\Editor\BurstAotCompiler.cs(358,62): error CS0117: 'AndroidArchitecture' does not contain a definition for 'X86'
Library\PackageCache\com.unity.burst@1.0.2\Editor\BurstAotCompiler.cs(636,32): error CS7036: There is no argument given that corresponds to the required formal parameter 'exceptionType' of 'BuildReport.AddMessage(LogType, string, string)'

- notice that the package installs Burst 1.0.2, which yields compilation errors in 2019.3.0a7
- Updating Burst to 1.1.0 fixes these issues, so ideally, the 2D animation package should link to a version of burst that doesn't break the unity project when installed