The published .xrefmap.json is broken

[dariusclay]

A recent change has resulted in the https://learn.microsoft.com/en-us/dotnet/.xrefmap.json containing no .NET Core types, only types for .NET Framework up to 4.8

This breaks our own CI pipelines for publishing our internal docs since we cross-link to the .NET APIs using xref. Now we get a ton of invalid cross references.

[dariusclay]

This was fine yesterday, so possibly related to #12607

@gewarren @BillWagner

[huangmin-ms]

This url https://learn.microsoft.com/en-us/dotnet/.xrefmap.json will default get the xrefmap file from docset with the highest priority.
I am not sure if your case is officially supported or not, if not we cannot guarantee the highest docset and the content in it will never change.
If you'd like get the officially support from Learn platform, please send email to Learn PM's CE-Skilling-PM@microsoft.com

cc @gewarren @davidle-ms

[dariusclay]

See https://dotnet.github.io/docfx/docs/links-and-cross-references.html#cross-reference-to-net-basic-class-library

The "highest" docset being .NET 4.8 is wrong.