Query text written in the client charset produces non-UTF-8 records in audit log

INSTALL PLUGIN server_audit SONAME 'server_audit2';

SET GLOBAL server_audit_file_path= 'nu.log';

SET GLOBAL server_audit_output_type= file;

SET GLOBAL server_audit_logging= ON;

--let $D= `SELECT @@datadir`

--enable_query_log

# (a) latin1 client: 0xE9 (e-acute) in the query text

--exec printf "SET NAMES latin1; SELECT 'caf\351' AS NUQMARK;\n" | $MYSQL --binary-mode test > /dev/null 2>&1

# (b) _binary literal with raw bytes 0xFF 0xFE

--exec printf "SELECT _binary'\377\376' AS NUQMARK;\n" | $MYSQL --binary-mode test > /dev/null 2>&1

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,4,25,QUERY,test,'SET GLOBAL server_audit_logging= ON',0

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,4,26,QUERY,test,'SELECT @@datadir',0

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,5,0,CONNECT,test,,0

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,5,27,QUERY,test,'SET NAMES latin1',0

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,5,28,QUERY,test,'SELECT \'caf�\' AS NUQMARK',0

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,5,0,DISCONNECT,test,,0

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,6,0,CONNECT,test,,0

20261016 08:27:07,ramesh-01.c.mariadb-engineering-qa.internal,root,localhost,6,30,QUERY,test,'SELECT _binary\'��\' AS NUQMARK',0