Me too can confirm, that the alias build by hql is too long:

the column name is "ant_fussstatus_untersucht" but when building hql select: "FROM tablename" alias is different and exception is coming:
...
Caused by: java.sql.SQLException: The identifier that starts with 'ant_fussstatus_untersucht12_27' is too long. Maximum length is 30.

by the way the table has 194 columns

Hibernate 5.2.6.Final
Sybase ASE 12.5.2
JDBC driver: jtds 1.3.1