Cannot run `spacetime publish` when csproj + sln live in same folder

I've been going through https://spacetimedb.com/docs/unity/part-3.

When opening the server-csharp folder in VS Code:

cd C:\dev\unity-games\blackholio\server-csharp
code .

It (C# DevKit?) automatically creates a server-csharp.sln file in the same folder as StdbModule.csproj.

After this, if I run spacetime publish --server local blackholio I get an error:

MSBUILD : error MSB1011: Specify which project or solution file to use because this folder contains more than one project or solution file.
Error: command ["dotnet", "publish", "-c", "Release", "-v", "quiet"] exited with code 1

There is no way to specify that StdbModule.csproj should be built.

--build-options is only used to specify additional options to the spacetime build command which gets invoked as part of spacetime publish.

Static dotnet publish execution:
https://github.com/clockworklabs/SpacetimeDB/blob/651f79d22cc4bb1c3c996ef2436186501a5d83bd/crates/cli/src/tasks/csharp.rs#L70C5-L70C65

The publish path is in crates/cli/src/tasks/csharp.rs, with the static dotnet publish invocation at line 70. Start there and reproduce with StdbModule.csproj and server-csharp.sln in one directory; done means spacetime publish --server local blackholio can build the intended project without MSB1011.