LINQ to Entities Contains bug

gistfile1.txt

string queryStr = "AB7";
var viewModel5 = (from n in db.TableName
                  where n.TableCol.Contains("AB7")
                  select n.TableCol); //running ToList with this returns 35 results
                  
                  //viewModel5 = {SELECT
                  //`Extent1`.`TableCol`
                  //FROM `TableName` AS `Extent1`
                  //WHERE `Extent1`.`TableCol` LIKE '%AB7%'}
                  
var viewModel6 = (from n in db.TableName
                  where n.TableCol.Contains(queryStr)
                  select n.TableCol); //running ToList with this returns 0 results
                  
                  //viewModel6 = {SELECT
                  //`Extent1`.`TableCol`
                  //FROM `TableName` AS `Extent1`
                  //WHERE `Extent1`.`TableCol` LIKE '%p__linq__0%'}
                  
var strEqualsStr = "AB7" == queryStr; //true