We fixed this issue today. The fix is available in beta here: https://www.skipper18.com/support/402/downloads-skipper-beta
Here is our testing sample for 119, 120 and 121 characters:
<?php
use Doctrine\ORM\Mapping as ORM;
/**
* @ORM\Entity
*/
class Entity2
{
/**
* @ORM\Column(type="string", length=255, nullable=true, name="contract_type_h", options={"collation":"ascii_bin"})
*/
private $t120;
/**
* @ORM\Column(
* type="string",
* length=255,
* nullable=true,
* name="contract_type_ha",
* options={"collation":"ascii_bin"}
* )
*/
private $t121;
/**
* @ORM\Column(type="string", length=255, nullable=true, name="contract_type_", options={"collation":"ascii_bin"})
*/
private $t119;
}