CREATE TABLE `tab1` (

  `col1` varchar(100) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 DATA DIRECTORY='/opt/mysql/'

When wsrep_sst_method=mariabackup and a table is defined with DATA DIRECTORY, an SST completes and table data is available.
When wsrep_sst_method=rsync and a table is defined with DATA DIRECTORY, an SST completes but the table cannot be queried:

MariaDB [testdd]> show create table tab1;

ERROR 1030 (HY000): Got error 194 "Tablespace is missing for a table" from storage engine InnoDB

Tested on 10.6.8-4-MariaDB-enterprise.