I have tried to setup one-way replication from wsrep cluster to another wsrep cluster.
I was use this article https://mariadb.com/kb/en/configuring-mariadb-replication-between-two-mariadb-galera-clusters/

I was choose one server from first cluster as replica master and put in config:

log-bin

binlog_format=ROW

log-basename=backup

expire_logs_days=2

log_slave_updates=ON

max_binlog_size=1073741824

Then i was made full backup and preapre it:

mariabackup --backup --user=user --password password --target-dir=/var/lib/backup/repl/

mariabackup --prepare --target-dir=/var/lib/backup/repl/ --use-memory=32G

Then copy to another server which i choose as replication slave.
And copt files back

mariabackup --copy-back --target-dir=/var/lib/backup/repl/ 

chown mysql:mysql /path/to/data/ -R

Got from file xtrabackup_binlog_info filename and pos (backup-bin.000017 and 47155747)

Then I was bootstrap new wsrep cluster with only 1 node and trying to start replication between this node and master.

CHANGE MASTER TO 

   MASTER_HOST="master-node", 

   MASTER_PORT=3306, 

   MASTER_USER="replica",  

   MASTER_PASSWORD="secret", 

   MASTER_LOG_FILE='backup-bin.000017',

   MASTER_LOG_POS=47155747;

START SLAVE;

And got error Node was dropped from the cluster. I was check error.log and got error:

2021-05-28  9:55:43 8723 [ERROR]  Slave SQL: Could not execute Update_rows_v1 event on table s1.table1; Can't find record in 'table1', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log backup-bin.000017, end_log_pos 47501643, Gtid 1-102-2391016143, Internal MariaDB error code: 1032

2021-05-28  9:55:43 8723 [ERROR] Slave SQL: Node has dropped from cluster, Gtid 1-102-2391016143, Internal MariaDB error code: 1047

2021-05-28  9:55:43 8723 [Note] Slave SQL thread exiting, replication stopped in log 'backup-bin.000017' at position 47501209

So i was checked what happend in binlog at this pos and find 1 record update. I was check this record on master and slave, it's present on master but not at slave. So I was checked does this record present in binlog and find insert query at position 47071167

As I understand problem in the backup operation or prepare operation. so I have not full data after backup or wrong position after prepare operation.

I was try to repeat it couple times but got same results. What I can check in configs or maybe I was missing something?