How to reproduce:
1. Open the attached project
2. Observe the Console window

Expected results: The project is opened successfully without any errors
Actual results: SysrootPackage throws not implement inherited abstract member errors forcing the Editor to enter Safe mode

Reproducible with: 2022.2.0a10, 2022.2.0a11
Not reproducible with: 2019.4.38f1, 2020.3.33f1, 2021.3.1f1, 2022.1.0f1, 2022.2.0a9

Notes:
1. Tested with Ubuntu 18.04

Errors thrown:
1. Library/PackageCache/com.unity.sysroot@1.0.0/Editor/Unity.SysrootPackage.cs(49,18): error CS0534: 'SysrootPackage' does not implement inherited abstract member 'Sysroot.GetToolchainPath()'
2. Library/PackageCache/com.unity.sysroot@1.0.0/Editor/Unity.SysrootPackage.cs(49,18): error CS0534: 'SysrootPackage' does not implement inherited abstract member 'Sysroot.GetIl2CppLinkerFlags()'
3. Library/PackageCache/com.unity.sysroot@1.0.0/Editor/Unity.SysrootPackage.cs(49,18): error CS0534: 'SysrootPackage' does not implement inherited abstract member 'Sysroot.GetSysrootPath()'
4. Library/PackageCache/com.unity.sysroot@1.0.0/Editor/Unity.SysrootPackage.cs(49,18): error CS0534: 'SysrootPackage' does not implement inherited abstract member 'Sysroot.GetIl2CppCompilerFlags()'