diff --git a/.nuke/build.schema.json b/.nuke/build.schema.json
index 4107d5b1f..e91aa1433 100644
--- a/.nuke/build.schema.json
+++ b/.nuke/build.schema.json
@@ -35,6 +35,7 @@
         "CreateNugetPackages",
         "DownloadApiBaselinePackages",
         "GenerateCppHeaders",
+        "InitDnx",
         "OutputApiDiff",
         "OutputVersion",
         "Package",
diff --git a/nukebuild/Build.cs b/nukebuild/Build.cs
index d6d636aac..1c8b3d37e 100644
--- a/nukebuild/Build.cs
+++ b/nukebuild/Build.cs
@@ -36,13 +36,13 @@ partial class Build : NukeBuild
 
     [NuGetPackage("Microsoft.DotNet.ApiCompat.Tool", "Microsoft.DotNet.ApiCompat.Tool.dll", Framework = "net8.0")]
     Tool ApiCompatTool;
-    
+
     [NuGetPackage("Microsoft.DotNet.ApiDiff.Tool", "Microsoft.DotNet.ApiDiff.Tool.dll", Framework = "net8.0")]
     Tool ApiDiffTool;
 
     [NuGetPackage("dotnet-ilrepack", "ILRepackTool.dll", Framework = "net8.0")]
     Tool IlRepackTool;
-    
+
     protected override void OnBuildInitialized()
     {
         Parameters = new BuildParameters(this, ScheduledTargets.Contains(BuildToNuGetCache));
@@ -57,6 +57,7 @@ partial class Build : NukeBuild
             Information("Repository Name: " + Parameters.RepositoryName);
             Information("Repository Branch: " + Parameters.RepositoryBranch);
         }
+
         Information("Configuration: " + Parameters.Configuration);
         Information("IsLocalBuild: " + Parameters.IsLocalBuild);
         Information("IsRunningOnUnix: " + Parameters.IsRunningOnUnix);
@@ -73,8 +74,9 @@ partial class Build : NukeBuild
         void ExecWait(string preamble, string command, string args)
         {
             Console.WriteLine(preamble);
-            Process.Start(new ProcessStartInfo(command, args) {UseShellExecute = false}).WaitForExit();
+            Process.Start(new ProcessStartInfo(command, args) { UseShellExecute = false }).WaitForExit();
         }
+
         ExecWait("dotnet version:", "dotnet", "--info");
         ExecWait("dotnet workloads:", "dotnet", "workload list");
         Information("Processor count: " + Environment.ProcessorCount);
@@ -99,6 +101,7 @@ partial class Build : NukeBuild
                 .AddProperty("SkipBuildingTests", "True");
         return c;
     }
+
     DotNetBuildSettings ApplySetting(DotNetBuildSettings c, Configure<DotNetBuildSettings> configurator = null) =>
         ApplySettingCore(c).Build.Apply(configurator);
 
@@ -129,6 +132,17 @@ partial class Build : NukeBuild
         }
     });
 
+    // Ensure that Bun.Official.Tool is downloaded at least once on CI to work around https://github.com/dotnet/sdk/issues/51831
+    Target InitDnx => _ => _
+        .Executes(() =>
+        {
+            var process = ProcessTasks.StartProcess(
+                "dnx",
+                "Bun.Unofficial.Tool --yes -- install",
+                $"{RootDirectory}/src/Browser/Avalonia.Browser/webapp");
+            process.AssertZeroExitCode();
+        });
+
     Target CompileNative => _ => _
         .DependsOn(Clean)
         .DependsOn(GenerateCppHeaders)
@@ -141,7 +155,7 @@ partial class Build : NukeBuild
         });
 
     Target Compile => _ => _
-        .DependsOn(Clean, CompileNative)
+        .DependsOn(Clean, CompileNative, InitDnx)
         .Executes(() =>
         {
             DotNetBuild(c => ApplySetting(c)
diff --git a/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj b/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj
index 44df6c13b..ec3f384b1 100644
--- a/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj
+++ b/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj
@@ -10,7 +10,7 @@
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <NugetPackageName>Avalonia</NugetPackageName>
-    <WebAppDir>Remote\HtmlTransport\webapp</WebAppDir>
+    <WebAppDir>$(MSBuildThisFileDirectory)Remote/HtmlTransport/webapp</WebAppDir>
   </PropertyGroup>
   <ItemGroup>
     <EmbeddedResource Include="Remote\HtmlTransport\webapp\build\**\*.gz" />
diff --git a/src/Browser/Avalonia.Browser/Avalonia.Browser.csproj b/src/Browser/Avalonia.Browser/Avalonia.Browser.csproj
index d51e6ed9a..26b82253a 100644
--- a/src/Browser/Avalonia.Browser/Avalonia.Browser.csproj
+++ b/src/Browser/Avalonia.Browser/Avalonia.Browser.csproj
@@ -3,7 +3,7 @@
     <TargetFrameworks>$(AvsCurrentTargetFramework);$(AvsCurrentBrowserTargetFramework)</TargetFrameworks>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <WebAppDir>webapp</WebAppDir>
+    <WebAppDir>$(MSBuildThisFileDirectory)webapp</WebAppDir>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/tests/Avalonia.DesignerSupport.Tests/Avalonia.DesignerSupport.Tests.csproj b/tests/Avalonia.DesignerSupport.Tests/Avalonia.DesignerSupport.Tests.csproj
index 77c1753c4..783630c1c 100644
--- a/tests/Avalonia.DesignerSupport.Tests/Avalonia.DesignerSupport.Tests.csproj
+++ b/tests/Avalonia.DesignerSupport.Tests/Avalonia.DesignerSupport.Tests.csproj
@@ -2,7 +2,7 @@
   <PropertyGroup>
     <TargetFramework>$(AvsCurrentTargetFramework)</TargetFramework>
     <OutputType>Library</OutputType>
-    <WebAppDir>Remote\HtmlTransport\webapp</WebAppDir>
+    <WebAppDir>$(MSBuildThisFileDirectory)Remote/HtmlTransport/webapp</WebAppDir>
   </PropertyGroup>
   <Import Project="..\..\build\UnitTests.NetCore.targets" />
   <Import Project="..\..\build\Moq.props" />