Corruption in online ALTER TABLE with ROW_FORMAT=REDUNDANT

/Server/bb-10.5-MDEV-24693/storage/innobase/rem/rem0rec.cc:1502: void rec_convert_dtuple_to_rec_comp(rec_t*, const dict_index_t*, const dfield_t*, ulint, rec_comp_status_t, bool) [with bool mblob = false; rec_t = unsigned char; ulint = long unsigned int]: Assertion `index->is_instant()' failed.

(rr) bt

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50

#1  0x00003ad76f402859 in __GI_abort () at abort.c:79

#2  0x00003ad76f402729 in __assert_fail_base (fmt=0x3ad76f598588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x564984cd5900 "index->is_instant()", file=0x564984cd4ce0 "/Server/bb-10.5-MDEV-24693/storage/innobase/rem/rem0rec.cc", line=1502, 

    function=<optimized out>) at assert.c:92

#3  0x00003ad76f413f36 in __GI___assert_fail (assertion=0x564984cd5900 "index->is_instant()", file=0x564984cd4ce0 "/Server/bb-10.5-MDEV-24693/storage/innobase/rem/rem0rec.cc", line=1502, 

    function=0x564984cda100 "void rec_convert_dtuple_to_rec_comp(rec_t*, const dict_index_t*, const dfield_t*, ulint, rec_comp_status_t, bool) [with bool mblob = false; rec_t = unsigned char; ulint = long unsigned int]") at assert.c:101

#4  0x00005649834eec31 in rec_convert_dtuple_to_rec_comp<>(rec_t *, const dict_index_t *, const dfield_t *, ulint, rec_comp_status_t, bool) (rec=0x52ac59bff008 "", index=0x6170006537a0, field=0x61a001399958, n_fields=17, status=REC_STATUS_INSTANT, temp=true)

    at /Server/bb-10.5-MDEV-24693/storage/innobase/rem/rem0rec.cc:1502

#5  0x00005649834dde1b in rec_convert_dtuple_to_temp (rec=0x52ac59bff008 "", index=0x6170006537a0, fields=0x61a001399958, n_fields=17, status=REC_STATUS_INSTANT) at /Server/bb-10.5-MDEV-24693/storage/innobase/rem/rem0rec.cc:1822

#6  0x00005649835b90c6 in row_log_table_low_redundant (rec=0x44dd4ec28094 "", index=0x6170006537a0, insert=true, old_pk=0x0, new_index=0x6170000da9a0) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0log.cc:918

#7  0x00005649835b9f96 in row_log_table_low (rec=0x44dd4ec28094 "", index=0x6170006537a0, offsets=0x19b12b551ae0, insert=true, old_pk=0x0) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0log.cc:992

#8  0x00005649835bd471 in row_log_table_insert (rec=0x44dd4ec28094 "", index=0x6170006537a0, offsets=0x19b12b551ae0) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0log.cc:1437

#9  0x000056498353f977 in row_ins_clust_index_entry_low (flags=0, mode=16386, index=0x6170006537a0, n_uniq=0, entry=0x61700058d4a0, n_ext=0, thr=0x6250000c3440) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0ins.cc:2781

#10 0x0000564983542090 in row_ins_clust_index_entry (index=0x6170006537a0, entry=0x61700058d4a0, thr=0x6250000c3440, n_ext=0) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0ins.cc:3208

#11 0x0000564983542a9a in row_ins_index_entry (index=0x6170006537a0, entry=0x61700058d4a0, thr=0x6250000c3440) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0ins.cc:3333

#12 0x0000564983543c0b in row_ins_index_entry_step (node=0x622000177930, thr=0x6250000c3440) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0ins.cc:3502

#13 0x00005649835446e4 in row_ins (node=0x622000177930, thr=0x6250000c3440) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0ins.cc:3661

#14 0x00005649835458ff in row_ins_step (thr=0x6250000c3440) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0ins.cc:3807

#15 0x000056498358f403 in row_insert_for_mysql (mysql_rec=0x6320000f0838 "\312\377\200", prebuilt=0x6220001771a0, ins_mode=ROW_INS_NORMAL) at /Server/bb-10.5-MDEV-24693/storage/innobase/row/row0mysql.cc:1421

#16 0x00005649831ed830 in ha_innobase::write_row (this=0x61d000759eb8, record=0x6320000f0838 "\312\377\200") at /Server/bb-10.5-MDEV-24693/storage/innobase/handler/ha_innodb.cc:7544

#17 0x00005649826ea3b7 in handler::ha_write_row (this=0x61d000759eb8, buf=0x6320000f0838 "\312\377\200") at /Server/bb-10.5-MDEV-24693/sql/handler.cc:7151

#18 0x0000564981df5476 in write_record (thd=0x62b00027d218, table=0x61900054ce98, info=0x19b12b553820, sink=0x0) at /Server/bb-10.5-MDEV-24693/sql/sql_insert.cc:2106

#19 0x0000564981decf33 in mysql_insert (thd=0x62b00027d218, table_list=0x62b0002843b0, fields=..., values_list=..., update_fields=..., update_values=..., duplic=DUP_ERROR, ignore=false, result=0x0) at /Server/bb-10.5-MDEV-24693/sql/sql_insert.cc:1099

#20 0x0000564981eb5868 in mysql_execute_command (thd=0x62b00027d218) at /Server/bb-10.5-MDEV-24693/sql/sql_parse.cc:4596

#21 0x0000564981ecdd70 in mysql_parse (thd=0x62b00027d218, rawbuf=0x62b000284238 "INSERT INTO t1 (tscol7) VALUES (NULL),(NULL) /* E_R Thread29 QNO 144 CON_ID 45 */", length=81, parser_state=0x19b12b5547c0, is_com_multi=false, is_next_command=false)

at /Server/bb-10.5-MDEV-24693/sql/sql_parse.cc:8062

#22 0x0000564981ea4069 in dispatch_command (command=COM_QUERY, thd=0x62b00027d218, packet=0x62900070d219 "INSERT INTO t1 (tscol7) VALUES (NULL),(NULL) /* E_R Thread29 QNO 144 CON_ID 45 */ ", packet_length=82, is_com_multi=false, is_next_command=false)

at /Server/bb-10.5-MDEV-24693/sql/sql_parse.cc:1889

#23 0x0000564981ea0992 in do_command (thd=0x62b00027d218) at /Server/bb-10.5-MDEV-24693/sql/sql_parse.cc:1370

#24 0x00005649822e31d7 in do_handle_one_connection (connect=0x60800008c138, put_in_cache=true) at /Server/bb-10.5-MDEV-24693/sql/sql_connect.cc:1410

#25 0x00005649822e2b40 in handle_one_connection (arg=0x60800008c138) at /Server/bb-10.5-MDEV-24693/sql/sql_connect.cc:1312

#26 0x0000564982fed983 in pfs_spawn_thread (arg=0x615000081198) at /Server/bb-10.5-MDEV-24693/storage/perfschema/pfs.cc:2201

#27 0x00004a6168c80609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#28 0x00003ad76f4ff293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95