I have this issue when using Jpa (default spring boot configuration) for the EventStore (the Autoconfigured JpaTransactionManager, the Jpa StorageEngine etc).
When I configure the Axon evenstore with plain Jdbc (JdbcStorageEngine, DataSourceTransaction manager etc), I do not have issues with Oracle (same table structure). But as we will probably be using Jpa for the query model, I would like to use it as well for the EventStore.