The same for me in 6.2.2.
I use
@Audited(modifiedColumnName="INHALT_M")
@JdbcTypeCode(SqlTypes.LONG32VARCHAR)
@Column(name="INHALT")
private String ivInhalt;

as recommend to use or long strings and postgres type text.
The result is as follows:
create table BENUTZER (BENUTZER_ID varchar(32) not null, LOCK_VERSION integer, SUBCLASS varchar(255), TENANT_ID varchar(32), INHALT text, primary key (BENUTZER_ID));

create table BENUTZER_A (BENUTZER_ID varchar(32) not null, REV integer not null, REVTYPE smallint, REVEND integer, TENANT_ID varchar(32), TENANT_ID_M boolean, INHALT_M boolean, INHALT varchar(255), primary key (BENUTZER_ID, REV));