These are known bugs for XStream in Oracle Database 12c Release 2 (12.2).
Using the XStream
IN replication, operations done in the application root container are not applied correctly because the application synchronization does not work due to a bug.
Do not use the XStream
IN replication to replicate operations done in the application root container. Manually apply these changes in the application root containers in the target. Note that operations done in the application pluggable databases (PDBs) can still be replicated.