OCI8: schema-tool:update is modifying not null boolean - NUMBER(1) columns to not null

/** @Entity @Table(name='st_node') */
class Node
{
    /** @Id @Column(type="integer") @GeneratedValue */
    protected $id;
    
    /** @Column(type="string", length="255") */
    protected $title;
    
    /** @Column(type="boolean", nullable=false) */
    protected $is_published;
    
    /** @Column(type="boolean") */
    protected $is_sticky;
    
    /** @Column(type="integer", length=4) */
    protected $hits;
    
    /** @Column(type="decimal", precision=4, scale=2) */
    protected $score;
}

./doctrine orm:schema-tool:update --force
Entities\Address
Entities\Node
Entities\Article
Entities\User
Entities\Page
Updating database schema...

  [Doctrine\DBAL\Driver\OCI8\OCI8Exception]                         
  ORA-01442: column to be modified to NOT NULL is already NOT NULL  
            

./doctrine orm:schema-tool:update --dump-sql
Entities\Address
Entities\Node
Entities\Article
Entities\User
Entities\Page
ALTER TABLE ST_NODE MODIFY (is_published  NUMBER(1) NOT NULL, is_sticky  NUMBER(1) NOT NULL)

CREATE TABLE "DOCTRINE"."ST_NODE"
  (
    "ID"           NUMBER(10,0) NOT NULL ENABLE,
    "TITLE"        VARCHAR2(255 BYTE) NOT NULL ENABLE,
    "DISCR"        VARCHAR2(255 BYTE) NOT NULL ENABLE,
    "IS_PUBLISHED" NUMBER(1,0) NOT NULL ENABLE,
    "HITS"         NUMBER(10,0) NOT NULL ENABLE,
    "SCORE"        NUMBER(4,2) NOT NULL ENABLE,
    "IS_STICKY"    NUMBER(1,0) NOT NULL ENABLE,
    PRIMARY KEY ("ID")
);