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ProjectStartedEvents for already-run projects have bad IDs

Area: Logging

Status: Open.

Bug

#12953 In dotnet/msbuild;

· rainersigwald opened on Dec 17, 2025

Documentation: clarify ResolveAssemblyReference locations for .NET SDK

Area: DocumentationIssues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)Issues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)

Area: Task: Resolve Assembly References (RAR)

Priority:3Work that is nice to haveWork that is nice to have

Status: Open.

#12949 In dotnet/msbuild;

· hickford opened on Dec 16, 2025

blazor big project: build perf downgrade

Area: Performance

Status: Open.

#12954 In dotnet/msbuild;

· AdmiralSnyder opened on Dec 15, 2025

error MSB4166: Child node "3" exited prematurely

Area: IPCIssues concerning how MSBuild communicates between processes, including serialization.Issues concerning how MSBuild communicates between processes, including serialization.

needs-investigation

Status: Open.

Bug

#12944 In dotnet/msbuild;

· Liklainy opened on Dec 15, 2025

ASP .Net Framework 4.8 webSITE cannot resolve assembly references for projects with dependency on netstandard2.0

Area: Task: Resolve Assembly References (RAR)

needs-investigation

Priority:2Work that is important, but not critical for the releaseWork that is important, but not critical for the release

Status: Open.

Bug

#12933 In dotnet/msbuild;

· johnazule opened on Dec 14, 2025

Terminal logger quiet mode hides projects

Area: Terminal LoggerProblems with the livelogger/fancylogger/terminallogger -tl functionality.Problems with the livelogger/fancylogger/terminallogger -tl functionality.

Status: Open.

Bug

#12929 In dotnet/msbuild;

· rainersigwald opened on Dec 12, 2025

MSB3030: Intermittent "Could not copy file because it was not found" in parallel builds copying reference PDBs

Area: TasksIssues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.Issues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.

author-respondedAuthor responded, needs response from dev team.Author responded, needs response from dev team.

Status: Open.

Bug

#12927 In dotnet/msbuild;

· ilonatommy opened on Dec 12, 2025

enable -mt task authors to unit test with TaskEnvironment

Status: Open.

Task

#12922 In dotnet/msbuild;

· JanProvaznik opened on Dec 11, 2025

Build Testing Infrastructure for capturing race conditions.

Area: Performance

Status: Open.

#12920 In dotnet/msbuild;

· AR-May opened on Dec 11, 2025

·  

.NET 10

Duplicated messages from SDK/environment resolution

Area: Logging

Area: NetSDK

Status: Open.

Bug

#12915 In dotnet/msbuild;

· rainersigwald opened on Dec 10, 2025

Provide a clearer error if a .NET Task assembly uses a .NET Runtime that is unsupported by the .NET Runtime of the .NET TaskHost Node

Area: TaskHost

untriaged

Status: Open.

Feature

#12913 In dotnet/msbuild;

· baronfel opened on Dec 10, 2025

MSB4216 for .NET 8: PackageReference 'Reqnroll.Tools.MsBuild.Generation' generates MSB4216 when compiling with SDK 8.0.416 (8.0.415 is OK)

author-respondedAuthor responded, needs response from dev team.Author responded, needs response from dev team.

Status: Open.

Bug

#12912 In dotnet/msbuild;

· 304NotModified opened on Dec 10, 2025