Query Builder does not create relations for composite primary keys in tables

Steps to reproduce:

1. Create two tables in the existing DB:

SQL
CREATE TABLE [dbo].[MultiFKTest_Source](
        [OrderId] [int] NOT NULL,
        [CustomerId] [nchar](5) NOT NULL,
        CONSTRAINT [PK_MultiFKTest_Source] PRIMARY KEY CLUSTERED ([OrderId] ASC, [CustomerId] ASC)
    )

CREATE TABLE [dbo].[MultiFKTest_Child](
        [Id] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY,
        [OrderId] [int] NOT NULL,
        [CustomerId] [nchar](5) NOT NULL,
        CONSTRAINT [FK_MultiFKTest_Child_Source] FOREIGN KEY([OrderId], [CustomerId])
            REFERENCES [dbo].[MultiFKTest_Source] ([OrderId], [CustomerId])
    )

2. Define a corresponding connection in Web.config and connection provider.
3. Run Query Builder and drop the MultiFKTest_Source and MultiFKTest_Child tables.

Current Result:
As you can see in the https://i.imgur.com/AD9mqkT.gifv screencast, the query builder creates only a single relation for the OrderId field.

Expected Result:
Two relations for the OrderId and CustomerId should be created.