dbz-oracle_connect :getCreateTableEvent(row 211) can't get the data meta by the schema and table name in lower case(default)

I use the debezium/example to test oracle cdc by xstream,
I run the script inventory.sql to create the table customers.
when I create the connect by register-oracle.json.
It shows :
Caused by: java.sql.SQLException: ORA-31603: object \"CUSTOMERS\" of type TABLE not found in schema \"DEBEZIUM\"

As I can't get source from the repos,I decompiled the jar,
I located the error to
ResultSet rs = statement.executeQuery("select dbms_metadata.get_ddl( 'TABLE', '" + table.id().table() + "', '" + table.id().schema() + "' )

with my exp in dbz-mysql and dbz-postgres
I think the schema value will be lower case here.

And I test in the oracle by sqlplus
1 select dbms_metadata.get_ddl('TABLE','CUSTOMERS','DEBEZIUM') from dual; OK
2 select dbms_metadata.get_ddl('TABLE','customers','debezium') from dual; will show the same error.

I also test the param "database.tablename.case.insensitive": true though I didn't see it works in the code . And it didn't work.

So Is there a way to solve my issues ? Thank you !