FLUSH LOGS doesn't work for Aria logs as intended?!?

I tried a lot to get incremental backups with Aria logs to work. In the progress I noticed FLUSH LOGS doesn't seem to work as intended. Steps:

cd <datadir>
mysql
-> USE demo
-> CREATE TABLE demo (id CHAR(17), c1 TINYINT UNSIGNED, c2 TINYINT UNSIGNED, c3 INT, c4 INT, PRIMARY KEY(id)) ENGINE=aria;
-> FLUSH LOGS; exit;
systemctl stop mariadb
aria_read_log -a

Result is a lot of output which signifies the log still holds the step(s) before FLUSH LOGS; Instead use:

cd <datadir>
mysql
-> USE demo
-> CREATE TABLE demo (id CHAR(17), c1 TINYINT UNSIGNED, c2 TINYINT UNSIGNED, c3 INT, c4 INT, PRIMARY KEY(id)) ENGINE=aria; exit;
rm aria_log*
systemctl restart mariadb
systemctl stop mariadb
aria_read_log -a

Result is a short output, amounting to "nothing happened". Do I misunderstand the meaning of FLUSH LOGS; ?