Error message with hibernate types during startup after upgrade to 2.9.1 from 2.4

[ninaHerpertz]

I just upgraded my quarkus application from 2.4 to 2.9 and I now see the following error during startup:

2022-05-19 11:21:29,344 ERROR [io.qua.hib.orm.run.sch.SchemaManagementIntegrator] (Hibernate post-boot validation thread for <default>) Failed to run post-boot validation: org.hibernate.MappingException: No Dialect mapping for JDBC type: 1111
	at org.hibernate.dialect.TypeNames.get(TypeNames.java:71)
	at org.hibernate.dialect.TypeNames.get(TypeNames.java:103)
	at org.hibernate.dialect.Dialect.getTypeName(Dialect.java:404)
	at org.hibernate.mapping.Column.getSqlType(Column.java:238)
	at org.hibernate.tool.schema.internal.AbstractSchemaValidator.validateColumnType(AbstractSchemaValidator.java:164)
	at org.hibernate.tool.schema.internal.AbstractSchemaValidator.validateTable(AbstractSchemaValidator.java:151)
	at org.hibernate.tool.schema.internal.GroupedSchemaValidatorImpl.validateTables(GroupedSchemaValidatorImpl.java:42)
	at org.hibernate.tool.schema.internal.AbstractSchemaValidator.performValidation(AbstractSchemaValidator.java:97)
	at org.hibernate.tool.schema.internal.AbstractSchemaValidator.doValidation(AbstractSchemaValidator.java:76)
	at io.quarkus.hibernate.orm.runtime.schema.SchemaManagementIntegrator.runPostBootValidation(SchemaManagementIntegrator.java:133)
	at io.quarkus.hibernate.orm.runtime.HibernateOrmRecorder$6.run(HibernateOrmRecorder.java:153)
	at java.base/java.lang.Thread.run(Thread.java:833)

I am using Vlad Mihalcesa's hibernate types on an MSSQL database in version 2.16.2.

I am only seeing this error, but the general functionality seems not to be impacted at first glance. I can still work with these entities so I am confused why the validation is throwing an error although the overall schema is working and all the hibernate types are (at least during runtime) recognized and functional.