Assertion `!is_set() || (m_status == DA_EOF_BULK && is_bulk_op())' failed on bulk INSERT ... RETURNING into a table with a trigger

CREATE TABLE t3 (id INT, val INT);

CREATE TABLE t3log (v INT);

CREATE TRIGGER t3_bi BEFORE INSERT ON t3 FOR EACH ROW

  INSERT INTO t3log VALUES (NEW.val);

-- bulk, parameter sets (1,10), (2,20), (3,30):

INSERT INTO t3 VALUES (?, ?) RETURNING id, val;

sql_error.cc:386: void Diagnostics_area::set_eof_status(THD*): Assertion `!is_set() || (m_status == DA_EOF_BULK && is_bulk_op())' failed.

sql/sql_class.h:6025(my_eof(THD*))

sql/sql_class.cc:3256(select_send::send_eof())

sql/sql_insert.cc:1448(mysql_insert(...))