I am using Hibernate 4.3.6 Final and observe this issue when running a HSQL in memory database. Should this still happen in this version?

When setting bernate.hbm2ddl.auto" to "create-drop" I am getting following warnings/errors:

WARN: org.hibernate.dialect.H2Dialect: HHH000431: Unable to determine H2 database version, certain features may not work
ERROR: org.hibernate.tool.hbm2ddl.SchemaExport: HHH000389: Unsuccessful: drop sequence if exists hibernate_sequence
ERROR: org.hibernate.tool.hbm2ddl.SchemaExport: Unexpected token: IF in statement [drop sequence if]