BC27 compilation fails with ALTool / analyzers – System.Runtime.CompilerServices.Unsafe 8.0.0.0

[bmagoisera]

We are hitting a blocking issue when compiling an AL extension targeting Business Central 27.

The compilation consistently fails with the following error:

Could not load type 'System.Object' from assembly
'System.Runtime.CompilerServices.Unsafe, Version=8.0.0.0'

Environment

Business Central: 27.0 (Sandbox)
AL Runtime: 16
Build: Azure DevOps pipeline
Agent: self-hosted Windows agent
Tooling: ALOps App Compiler v2 (using ALTool from BC27 VSIX)
PowerShell: 5.1
BcContainerHelper: 6.1.6
Code analyzers enabled:
CodeCop
PerTenantExtensionCop
UICop

What we observe

The error happens when analyzers are being loaded.
The same pipeline works fine on previous BC versions.

This only fails on BC 27.

Disabling analyzers allows the build to continue.

We upgraded the build agent to .NET 8, but the issue remains unchanged.

Question

Is this a known compatibility issue between BC27 / ALTool / analyzers?
Is there a recommended fix or workaround?

[waldo1001]

Can you share the yaml and the output, please?

few pointers: make sure you set pwsh to true to use PowerShell 7

install your agents with the pinned guidelines: #745

[waldo1001]

I'm pretty sure it's the PS7 - could you come back with feedback?

[bmagoisera]

Thanks Waldo1001.. It's ok . With pwsh=true