Query: Navs: Compiler exception when projecting nav through GroupJoin

[anpete]

Query:

from c in context.Set<Customer>()
join o in context.Set<Order>().Select(o => o.Customer)
   on c.CustomerID equals o.CustomerID into g
where c.CustomerID == "ALFKI"
select new { c, g }

Stack:

System.InvalidOperationException : variable 'o.Customer' of type 'Microsoft.EntityFrameworkCore.Specification.Tests.TestModels.Northwind.Customer' referenced from scope '', but it is not defined
	at System.Linq.Expressions.Compiler.VariableBinder.Reference(ParameterExpression node, VariableStorageKind storage)
	at System.Linq.Expressions.Compiler.VariableBinder.VisitParameter(ParameterExpression node)
	at System.Linq.Expressions.ParameterExpression.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1 nodes)
	at System.Linq.Expressions.Compiler.VariableBinder.VisitLambda[T](Expression`1 node)
	at System.Linq.Expressions.Expression`1.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)
	at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)
	at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)
	at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)
	at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)
	at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)
	at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)
	at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)
	at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)
	at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)
	at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1 nodes)
	at System.Linq.Expressions.Compiler.VariableBinder.VisitLambda[T](Expression`1 node)
	at System.Linq.Expressions.Expression`1.Accept(ExpressionVisitor visitor)
	at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
	at System.Linq.Expressions.Compiler.LambdaCompiler.Compile(LambdaExpression lambda, DebugInfoGenerator debugInfoGenerator)
	at System.Linq.Expressions.Expression`1.Compile()
	at Microsoft.EntityFrameworkCore.Query.EntityQueryModelVisitor.CreateExecutorLambda[TResults]()

[smitpatel]

Duplicate of #17068