Cursor protocol returns rows_sent=0 from mysql.slow_log (v. 10.4, 10.5) and from v. 10.6 empty result for all colums

--log-output=table,file --slow-query-log --general-log

SET SESSION long_query_time = 0;

SET GLOBAL slow_query_log = ON;

FLUSH LOGS;

TRUNCATE TABLE mysql.slow_log;

# Let there be three columns, unique, non-unique, and non-indexed:

CREATE TABLE t1 (f1 SERIAL,f2 INT, f3 INT, PRIMARY KEY(f1), KEY(f2));

INSERT INTO t1 VALUES (1,1,1);

INSERT INTO t1 VALUES (2,2,2);

INSERT INTO t1 VALUES (3,3,3);

INSERT INTO t1 VALUES (4,4,4);

SELECT SQL_NO_CACHE 'Bug#31700 - SCAN',f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f3=4;

SELECT SQL_NO_CACHE 'Bug#31700 - KEY', f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f2=3;

SELECT SQL_NO_CACHE 'Bug#31700 - PK',  f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f1=2;

--replace_column 1 TIMESTAMP

SELECT start_time, rows_examined, rows_sent, sql_text FROM mysql.slow_log WHERE sql_text LIKE '%Bug#31700%' ORDER BY start_time;

DROP TABLE t1;

TRUNCATE TABLE mysql.slow_log;

start_time	rows_examined	rows_sent	sql_text

TIMESTAMP	4	1	SELECT SQL_NO_CACHE 'Bug#31700 - SCAN',f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f3=4

TIMESTAMP	1	1	SELECT SQL_NO_CACHE 'Bug#31700 - KEY', f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f2=3

TIMESTAMP	1	1	SELECT SQL_NO_CACHE 'Bug#31700 - PK',  f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f1=2

start_time	rows_examined	rows_sent	sql_text

TIMESTAMP	4	0	SELECT SQL_NO_CACHE 'Bug#31700 - SCAN',f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f3=4

TIMESTAMP	1	0	SELECT SQL_NO_CACHE 'Bug#31700 - KEY', f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f2=3

TIMESTAMP	1	0	SELECT SQL_NO_CACHE 'Bug#31700 - PK',  f1,f2,f3,SLEEP(1.1) FROM t1 WHERE f1=2

start_time	rows_examined	rows_sent	sql_text