dotnet / dotnet/vscode-csharp

Cannot debug wasm based blazor webapp projects after new release

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C#DK Debugger untriaged
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TypeScript
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Description

Type: Bug

## Issue Description ##
Updated to C# 2.140.8. Before the update, i can press f5 and debug my application with chromium opening no issue to have wasm based breakpoints. Now the dev server does not start and remains pending, unable to debug my application
## Steps to Reproduce ##
- Update to 2.140.8
- press f5 to launch a blazor webapp interactive client application
- Chromium / Chrome page doesn't launch
## Expected Behavior ##
- press f5 to launch a blazor webapp interactive client application
- Chromium / Chrome page launches with debugger atached
## Actual Behavior ##
- Chromium / Chrome page doesn't launch and debugger is stuck

Extension version: 2.140.8
VS Code version: Code 1.120.0 (0958016b2af9f09bb4257e0df4a95e2f90590f9f, 2026-05-12T20:17:22Z)
OS version: Linux x64 7.0.0-15-generic
Modes:

### Logs ###

### C# log ###

```
2026-05-15 10:51:34.124 [info] Locating .NET runtime version 10.0.5
2026-05-15 10:51:34.406 [info] Dotnet path: /home/nick/.dotnet/dotnet
2026-05-15 10:51:34.406 [info] Activating C# + C# Dev Kit...
2026-05-15 10:51:34.627 [info] info: Program[0]
2026-05-15 10:51:34.627 [info] Server started with process ID 1421130
2026-05-15 10:51:35.085 [info] [Program] Language server initialized
2026-05-15 10:51:35.088 [info] [Program] Monitoring client process 1419972 for exit
2026-05-15 10:51:35.537 [info] [initialized] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsEntryPointDiscovery] Finished discovery in '/home/nick/repos/work/[REDACTED]' in 11 milliseconds

```

### C# LSP Trace Logs log ###

```

```

## Environment Information ##
**VSCode version**: 1.120.0
**C# Extension**: 2.140.8
**Using OmniSharp**: false

Dotnet Information
.NET SDK:
Version: 10.0.300
Commit: caa81fa497
Workload version: 10.0.300-manifests.b47d7e23
MSBuild version: 18.6.3+caa81fa49

Runtime Environment:
OS Name: ubuntu
OS Version: 26.04
OS Platform: Linux
RID: linux-x64
Base Path: /home/nick/.dotnet/sdk/10.0.300/

.NET workloads installed:
There are no installed workloads to display.
Configured to use workload sets when installing new manifests.
No workload sets are installed. Run "dotnet workload restore" to install a workload set.

Host:
Version: 10.0.8
Architecture: x64
Commit: 94ea82652c

.NET SDKs installed:
8.0.420 [/home/nick/.dotnet/sdk]
10.0.203 [/home/nick/.dotnet/sdk]
10.0.300 [/home/nick/.dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.26 [/home/nick/.dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.7 [/home/nick/.dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.8 [/home/nick/.dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.26 [/home/nick/.dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.7 [/home/nick/.dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.8 [/home/nick/.dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
DOTNET_CLI_TELEMETRY_OPTOUT [1]
DOTNET_CLI_UI_LANGUAGE [en-US]
DOTNET_ROOT [/home/nick/.dotnet]
DOTNET_WATCH_PROCESS_CLEANUP_TIMEOUT_MS [100]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

|Extension|Author|Version|Folder Name|
|---|---|---|---|
|astro-vscode|astro-build|2.16.14|astro-build.astro-vscode-2.16.14-linux-x64|
|autoimport|steoates|1.5.4|steoates.autoimport-1.5.4|
|blazorwasm-companion|ms-dotnettools|1.1.4|ms-dotnettools.blazorwasm-companion-1.1.4|
|cmake-tools|ms-vscode|1.23.52|ms-vscode.cmake-tools-1.23.52|
|comment-anchors|ExodiusStudios|1.10.4|exodiusstudios.comment-anchors-1.10.4|
|cpp-devtools|ms-vscode|0.5.13|ms-vscode.cpp-devtools-0.5.13|
|cpptools|ms-vscode|1.32.2|ms-vscode.cpptools-1.32.2-linux-x64|
|cpptools-extension-pack|ms-vscode|1.5.1|ms-vscode.cpptools-extension-pack-1.5.1|
|cpptools-themes|ms-vscode|2.0.0|ms-vscode.cpptools-themes-2.0.0|
|csdevkit|ms-dotnettools|3.20.195|ms-dotnettools.csdevkit-3.20.195-linux-x64|
|csharp|ms-dotnettools|2.140.8|ms-dotnettools.csharp-2.140.8-linux-x64|
|erb|CraigMaslowski|0.0.1|craigmaslowski.erb-0.0.1|
|FreeMarker|dcortes92|0.0.9|dcortes92.freemarker-0.0.9|
|gruvbox|jdinhlife|1.29.1|jdinhlife.gruvbox-1.29.1|
|markdown-all-in-one|yzhang|3.6.3|yzhang.markdown-all-in-one-3.6.3|
|material-icon-theme|PKief|5.34.0|pkief.material-icon-theme-5.34.0|
|ng-template|Angular|21.2.3|angular.ng-template-21.2.3|
|npm-intellisense|christian-kohler|1.4.5|christian-kohler.npm-intellisense-1.4.5|
|playwright|ms-playwright|1.1.19|ms-playwright.playwright-1.1.19|
|postcss|csstools|1.0.9|csstools.postcss-1.0.9|
|remote-containers|ms-vscode-remote|0.459.0|ms-vscode-remote.remote-containers-0.459.0|
|remote-explorer|ms-vscode|0.5.0|ms-vscode.remote-explorer-0.5.0|
|remote-server|ms-vscode|1.5.3|ms-vscode.remote-server-1.5.3|
|remote-ssh|ms-vscode-remote|0.122.0|ms-vscode-remote.remote-ssh-0.122.0|
|remote-ssh-edit|ms-vscode-remote|0.87.0|ms-vscode-remote.remote-ssh-edit-0.87.0|
|remote-wsl|ms-vscode-remote|0.104.3|ms-vscode-remote.remote-wsl-0.104.3|
|ruby-extensions-pack|Shopify|0.1.14|shopify.ruby-extensions-pack-0.1.14|
|ruby-lsp|Shopify|0.10.3|shopify.ruby-lsp-0.10.3|
|ruby-rubocop|misogi|0.8.6|misogi.ruby-rubocop-0.8.6|
|svelte-vscode|svelte|110.0.0|svelte.svelte-vscode-110.0.0|
|uncanny-cognitive-complexity|Dabolus|1.2.0|dabolus.uncanny-cognitive-complexity-1.2.0|
|vscode-azure-github-copilot|ms-azuretools|1.0.201|ms-azuretools.vscode-azure-github-copilot-1.0.201-linux-x64|
|vscode-azure-mcp-server|ms-azuretools|2.0.43|ms-azuretools.vscode-azure-mcp-server-2.0.43-linux-x64|
|vscode-azurefunctions|ms-azuretools|1.21.0|ms-azuretools.vscode-azurefunctions-1.21.0|
|vscode-azureresourcegroups|ms-azuretools|0.12.4|ms-azuretools.vscode-azureresourcegroups-0.12.4|
|vscode-azurestaticwebapps|ms-azuretools|0.13.2|ms-azuretools.vscode-azurestaticwebapps-0.13.2|
|vscode-azurestorage|ms-azuretools|0.17.1|ms-azuretools.vscode-azurestorage-0.17.1|
|vscode-commons|redhat|0.0.6|redhat.vscode-commons-0.0.6|
|vscode-containers|ms-azuretools|2.4.4|ms-azuretools.vscode-containers-2.4.4|
|vscode-dotnet-runtime|ms-dotnettools|3.0.2|ms-dotnettools.vscode-dotnet-runtime-3.0.2|
|vscode-eslint|dbaeumer|3.0.24|dbaeumer.vscode-eslint-3.0.24|
|vscode-kubernetes-tools|ms-kubernetes-tools|1.3.29|ms-kubernetes-tools.vscode-kubernetes-tools-1.3.29|
|vscode-node-azure-pack|ms-vscode|1.8.2|ms-vscode.vscode-node-azure-pack-1.8.2|
|vscode-rdbg|KoichiSasada|0.2.2|koichisasada.vscode-rdbg-0.2.2|
|vscode-remote-extensionpack|ms-vscode-remote|0.26.0|ms-vscode-remote.vscode-remote-extensionpack-0.26.0|
|vscode-tailwindcss|bradlc|0.14.29|bradlc.vscode-tailwindcss-0.14.29|
|vscode-xml|redhat|0.29.2|redhat.vscode-xml-0.29.2-linux-x64|
|vscode-yaml|redhat|1.23.0|redhat.vscode-yaml-1.23.0|;

C# Settings

|Setting|Value|
|---|---|
|preferCSharpExtension|false|
|compilerDiagnosticScope|openFiles|
|analyzerDiagnosticScope|openFiles|
|enableXamlTools|true|
|useServerGC|true|;

System Info

|Item|Value|
|---|---|
|CPUs|Intel(R) Core(TM) Ultra 7 155H (22 x 4129)|
|GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x8086 [Google Inc. (Intel)], DEVICE=0x7d55 [ANGLE (Intel, Mesa Intel(R) Arc(tm) Graphics (MTL), OpenGL ES 3.2 Mesa 26.0.3-1ubuntu1)], DRIVER_VENDOR=Mesa, DRIVER_VERSION=26.0.3 *ACTIVE*
Machine model name:
Machine model version:
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
trees_in_viz: disabled_off
video_decode: enabled
video_encode: disabled_software
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: disabled_off
webnn: disabled_off|
|Load (avg)|2, 2, 2|
|Memory (System)|30.31GB (4.86GB free)|
|Process Argv||
|Screen Reader|no|
|VM|67%|
|DESKTOP_SESSION|ubuntu|
|XDG_CURRENT_DESKTOP|ubuntu:GNOME|
|XDG_SESSION_DESKTOP|ubuntu|
|XDG_SESSION_TYPE|wayland|

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