Assertion `!is_set() || (m_status == DA_OK_BULK && is_bulk_op())' failed upon SELECT from S3 table with concurrent BACKUP stage

CREATE TABLE t1 (a INT);

ALTER TABLE t1 ENGINE=S3;

--connect (con1,localhost,root,,test)

BACKUP STAGE START;

--connection default

--send

SELECT * FROM t1;

--connection con1

BACKUP STAGE BLOCK_COMMIT;

# Cleanup

BACKUP STAGE END;

--disconnect con1

--connection default

--reap

DROP TABLE t1;

mysqld: /data/src/10.5/sql/sql_error.cc:335: void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*): Assertion `!is_set() || (m_status == DA_OK_BULK && is_bulk_op())' failed.

190524 15:44:35 [ERROR] mysqld got signal 6 ;

#6  0x00007fedcaf36e67 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x5615e72998e8 "!is_set() || (m_status == DA_OK_BULK && is_bulk_op())", file=file@entry=0x5615e7299828 "/data/src/10.5/sql/sql_error.cc", line=line@entry=335, function=function@entry=0x5615e7299c00 <Diagnostics_area::set_ok_status(unsigned long long, unsigned long long, char const*)::__PRETTY_FUNCTION__> "void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*)") at assert.c:92

#7  0x00007fedcaf36f12 in __GI___assert_fail (assertion=0x5615e72998e8 "!is_set() || (m_status == DA_OK_BULK && is_bulk_op())", file=0x5615e7299828 "/data/src/10.5/sql/sql_error.cc", line=335, function=0x5615e7299c00 <Diagnostics_area::set_ok_status(unsigned long long, unsigned long long, char const*)::__PRETTY_FUNCTION__> "void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*)") at assert.c:101

#8  0x00005615e6649fb1 in Diagnostics_area::set_ok_status (this=0x7feda00064c8, affected_rows=0, last_insert_id=0, message=0x0) at /data/src/10.5/sql/sql_error.cc:335

#9  0x00005615e65f1ca6 in my_ok (thd=0x7feda0000b10, affected_rows_arg=0, id=0, message=0x0) at /data/src/10.5/sql/sql_class.h:4993

#10 0x00005615e66a01ab in mysql_execute_command (thd=0x7feda0000b10) at /data/src/10.5/sql/sql_parse.cc:5285

#11 0x00005615e66aa08b in mysql_parse (thd=0x7feda0000b10, rawbuf=0x7feda0011fc8 "BACKUP STAGE BLOCK_COMMIT", length=25, parser_state=0x7fedbd4df180, is_com_multi=false, is_next_command=false) at /data/src/10.5/sql/sql_parse.cc:8152

#12 0x00005615e6695715 in dispatch_command (command=COM_QUERY, thd=0x7feda0000b10, packet=0x7feda0008591 "BACKUP STAGE BLOCK_COMMIT", packet_length=25, is_com_multi=false, is_next_command=false) at /data/src/10.5/sql/sql_parse.cc:1829

#13 0x00005615e6693ed5 in do_command (thd=0x7feda0000b10) at /data/src/10.5/sql/sql_parse.cc:1362

#14 0x00005615e680be5b in do_handle_one_connection (connect=0x5615e9b78e80, put_in_cache=true) at /data/src/10.5/sql/sql_connect.cc:1413

#15 0x00005615e680bb9f in handle_one_connection (arg=0x5615e9b78e80) at /data/src/10.5/sql/sql_connect.cc:1309

#16 0x00005615e713f953 in pfs_spawn_thread (arg=0x5615e9b78ad0) at /data/src/10.5/storage/perfschema/pfs.cc:1862

#17 0x00007fedcd3124a4 in start_thread (arg=0x7fedbd4e0700) at pthread_create.c:456

#18 0x00007fedcaff3d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97