xunit, We just shipped v2 Core Framework 2.6.4, Analyzers 1.8.0, and Visual Studio adapter 2.5.6. This release is primary a bug fix release, but does include reintroduction of support for VS2019 16.11+ for the analyzers project.
Enjoy!
Release notes:
https://xunit.net/releases/v2/2.6.4
https://xunit.net/releases/analyzers/1.8.0
https://xunit.net/releases/visualstudio/2.5.6