Maybe creating a explicit cast before send to Processo on EF?

public class ExpressionTransformer : ExpressionVisitor
{
    protected override Expression VisitBinary(BinaryExpression node)
    {
        if (node.NodeType == ExpressionType.NotEqual && node.Right is ConstantExpression constant && constant.Value == null)
        {
            if (node.Left is MemberExpression member)
            {
                var memberType = GetMemberType(member.Member);
                if (IsEnumerable(memberType))
               

{                     var enumerableType = memberType.GetInterface("IEnumerable`1") ?? typeof(System.Collections.IEnumerable);                     var castExpression = Expression.TypeAs(member, enumerableType);                     return Expression.NotEqual(castExpression, Expression.Constant(null));                 }

            }
        }

        return base.VisitBinary(node);
    }

    private static Type GetMemberType(MemberInfo member)
    {
        return member.MemberType switch
       

{             MemberTypes.Property => ((PropertyInfo)member).PropertyType,             MemberTypes.Field => ((FieldInfo)member).FieldType,             _ => throw new ArgumentException("Invalid member type")         }

;
    }

    private static bool IsEnumerable(Type type)
   

{         return typeof(System.Collections.IEnumerable).IsAssignableFrom(type) && type != typeof(string);     }

}