I have a Visual Studio 2019 (16.5.4) solution with about 10 .Net Core projects, some are netcoreapp3.1 others are netstandard2.0. Some have project references to the other projects, most have NuPkg dependencies.
If I attempt to generate a Code Map from the solution, most projects render as expected in in the map, while 2 projects render with a red X next to the assembly name with no ability to expand the node.
I have no idea what the Code Map doesn't like. At first I thought it was the netcoreapp3.1 but I tried adding a new project of that time and it renders fine.
EDIT: After trying to create a simple project to reproduce the issue, i've narrowed it to the inclusion of this package reference:
<ItemGroup>
<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.5" />
</ItemGroup>
So, there is something in this library that's causing the map to crash?
Is there some log file or other telemetry that I can use to help troubleshoot this issue so I can revise the projects to generate a successful map?
Thanks
-John

I contacted the person responsible for VS Architecture Tools in the Microsoft product group.
In the end, it was determined that this was a problem to be fixed. I opened a feedback here:
https://developercommunity.visualstudio.com/content/problem/1003585/code-map-comes-up-with-errors-when-install-azure-f.html
Microsoft will gauge how many customers are affected by this and repair prioritize accordingly with this feedback. You can vote to this feedback.:)