func settings delete --connectionString can't delete Connection Strings

[doggy8088]

I'm using Azure Functions Core Tools v3.

Here are the steps to reproduce:

1. dotnet new globaljson --sdk-version 3.1.413

2. mkdir funcapp1 && cd funcapp1 && func init --worker-runtime dotnet

3. func new -t "HttpTrigger" -n "Login" -a "anonymous"

4. func settings add DefaultConnection "Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;" --connectionString

5. func settings list -a

   App Settings:
   -> Name: AzureWebJobsStorage
       Value: UseDevelopmentStorage=true
   
   -> Name: FUNCTIONS_WORKER_RUNTIME
       Value: dotnet
   
   Connection Strings:
   -> Name: DefaultConnection
       Value: Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;
       ProviderName: System.Data.SqlClient

6. func settings delete DefaultConnection --connectionString

7. func settings list -a which is nothing happen. The DefaultConnection was not been deleted.

   App Settings:
   -> Name: AzureWebJobsStorage
       Value: UseDevelopmentStorage=true
   
   -> Name: FUNCTIONS_WORKER_RUNTIME
       Value: dotnet
   
   Connection Strings:
   -> Name: DefaultConnection
       Value: Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;
       ProviderName: System.Data.SqlClient

[doggy8088]

The v3 and v4 are all buggy.