Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I try to host a Blazor WASM app under the path <host>/dev using the property <StaticWebAssetBasePath>dev</StaticWebAssetBasePath>. My project is also referencing the third-party library MudBlazor and when I do dotnet publish -c Debug -o <path> the output is just fine, i.e. MudBlazor is below the dev/_content folder:

But when I run dotnet watch the files are not located under the dev/_content path but directly under _content (
the target framework is net7.0):

Expected Behavior

I expect that <StaticWebAssetBasePath>dev</StaticWebAssetBasePath> is also applied to third-party libraries when running dotnet watch.

Steps To Reproduce

1. Run

dotnet new blazorwasm 
dotnet add package MudBlazor

2. Edit the .csproj file and add <StaticWebAssetBasePath>dev</StaticWebAssetBasePath>.
3. Run dotnet publish
4. Have look into the published folder, it looks fine (_content/MudBlazor is located under wwwroot/dev).
5. Run dotnet watch
6. Try to load the file http://localhost:<your-port>/dev/_content/MudBlazor/MudBlazor.min.js: it fails
7. Try to load the file http://localhost:<your-port>/_content/MudBlazor/MudBlazor.min.js: it succeeds

Exceptions (if any)

No response

.NET Version

7.0.101

Anything else?

VS Code watch task

The project Veltrup.Server references and serves the WASM client project.

dotnet --info

.NET SDK:
Version: 7.0.101
Commit: bb24aafa11

Laufzeitumgebung:
OS Name: ubuntu
OS Version: 22.10
OS Platform: Linux
RID: linux-x64
Base Path: /home/vincent/Dokumente/Software/dotnet/sdk/7.0.101/

Host:
Version: 7.0.1
Architecture: x64
Commit: 97203d38ba

.NET SDKs installed:
5.0.408 [/home/vincent/Dokumente/Software/dotnet/sdk]
6.0.404 [/home/vincent/Dokumente/Software/dotnet/sdk]
7.0.101 [/home/vincent/Dokumente/Software/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 5.0.17 [/home/vincent/Dokumente/Software/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.12 [/home/vincent/Dokumente/Software/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.1 [/home/vincent/Dokumente/Software/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 5.0.17 [/home/vincent/Dokumente/Software/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.12 [/home/vincent/Dokumente/Software/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.1 [/home/vincent/Dokumente/Software/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
DOTNET_ROOT [/home/vincent/Dokumente/Software/dotnet]

global.json file:
Not found

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