Assertion `0' failed in btr_page_reorganize_low upon DROP COLUMN

--source include/have_innodb.inc

CREATE TABLE t1 (

  pk INT,

  i INT,

  b TINYBLOB NOT NULL,

  primary key (pk)

) ENGINE=InnoDB ROW_FORMAT=DYNAMIC;

INSERT INTO t1 VALUES  (1,10,'foo');

ALTER TABLE t1 DROP COLUMN b;

REPLACE INTO t1 VALUES (2,20);

--source include/restart_mysqld.inc

ALTER TABLE t1 DROP COLUMN i;

# Cleanup

DROP TABLE t1;

2019-01-12 20:09:35 8 [ERROR] InnoDB: Page old data size 125 new data size 296, page old max ins size 16125 new max ins size 15954

2019-01-12 20:09:35 8 [ERROR] InnoDB: Submit a detailed bug report to https://jira.mariadb.org/

mysqld: /data/src/10.4/storage/innobase/btr/btr0btr.cc:1670: bool btr_page_reorganize_low(bool, ulint, page_cur_t*, dict_index_t*, mtr_t*): Assertion `0' failed.

190112 20:09:35 [ERROR] mysqld got signal 6 ;

#7  0x00007f035d242ee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x00005626630a19ed in btr_page_reorganize_low (recovery=false, z_level=6, cursor=0x7f035256fde8, index=0x7f0328014eb8, mtr=0x7f035256ff00) at /data/src/10.4/storage/innobase/btr/btr0btr.cc:1670

#9  0x00005626630a2180 in btr_page_reorganize (cursor=0x7f035256fde8, index=0x7f0328014eb8, mtr=0x7f035256ff00) at /data/src/10.4/storage/innobase/btr/btr0btr.cc:1825

#10 0x00005626630ce340 in btr_cur_pessimistic_update (flags=10, cursor=0x7f035256fde0, offsets=0x7f035256fd00, offsets_heap=0x7f035256fd08, entry_heap=0x7f030c055d40, big_rec=0x7f035256fd10, update=0x7f030c058840, cmpl_info=1, thr=0x7f030c058788, trx_id=48, mtr=0x7f035256ff00) at /data/src/10.4/storage/innobase/btr/btr0cur.cc:5047

#11 0x0000562662ea79c8 in innobase_instant_try (ha_alter_info=0x7f0352571bc0, ctx=0x7f030c0186f8, altered_table=0x7f030c053dc0, table=0x7f030c029a90, trx=0x7f0358011258) at /data/src/10.4/storage/innobase/handler/handler0alter.cc:5713

#12 0x0000562662ec2a0f in commit_try_norebuild (ha_alter_info=0x7f0352571bc0, ctx=0x7f030c0186f8, altered_table=0x7f030c053dc0, old_table=0x7f030c029a90, trx=0x7f0358011258, table_name=0x7f030c0278ad "t1") at /data/src/10.4/storage/innobase/handler/handler0alter.cc:10138

#13 0x0000562662eb52d4 in ha_innobase::commit_inplace_alter_table (this=0x7f030c02ab28, altered_table=0x7f030c053dc0, ha_alter_info=0x7f0352571bc0, commit=true) at /data/src/10.4/storage/innobase/handler/handler0alter.cc:10767

#14 0x0000562662b44cf4 in handler::ha_commit_inplace_alter_table (this=0x7f030c02ab28, altered_table=0x7f030c053dc0, ha_alter_info=0x7f0352571bc0, commit=true) at /data/src/10.4/sql/handler.cc:4492

#15 0x000056266290451c in mysql_inplace_alter_table (thd=0x7f030c000b00, table_list=0x7f030c017360, table=0x7f030c029a90, altered_table=0x7f030c053dc0, ha_alter_info=0x7f0352571bc0, inplace_supported=HA_ALTER_INPLACE_INSTANT, target_mdl_request=0x7f0352571cf0, alter_ctx=0x7f03525728e0) at /data/src/10.4/sql/sql_table.cc:7590

#16 0x000056266290a37d in mysql_alter_table (thd=0x7f030c000b00, new_db=0x7f030c0051c8, new_name=0x7f030c005598, create_info=0x7f03525734d0, table_list=0x7f030c017360, alter_info=0x7f0352573410, order_num=0, order=0x0, ignore=false) at /data/src/10.4/sql/sql_table.cc:9690

#17 0x00005626629949fb in Sql_cmd_alter_table::execute (this=0x7f030c0179c8, thd=0x7f030c000b00) at /data/src/10.4/sql/sql_alter.cc:497

#18 0x0000562662831c96 in mysql_execute_command (thd=0x7f030c000b00) at /data/src/10.4/sql/sql_parse.cc:6302

#19 0x0000562662836bc2 in mysql_parse (thd=0x7f030c000b00, rawbuf=0x7f030c017278 "ALTER TABLE t1 DROP COLUMN i", length=28, parser_state=0x7f0352574600, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:8104

#20 0x0000562662823dec in dispatch_command (command=COM_QUERY, thd=0x7f030c000b00, packet=0x7f030c00b421 "ALTER TABLE t1 DROP COLUMN i", packet_length=28, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1851

#21 0x0000562662822810 in do_command (thd=0x7f030c000b00) at /data/src/10.4/sql/sql_parse.cc:1396

#22 0x000056266298ea3e in do_handle_one_connection (connect=0x5626663d3220) at /data/src/10.4/sql/sql_connect.cc:1402

#23 0x000056266298e7c2 in handle_one_connection (arg=0x5626663d3220) at /data/src/10.4/sql/sql_connect.cc:1308

#24 0x0000562662e4dc90 in pfs_spawn_thread (arg=0x5626663ce1c0) at /data/src/10.4/storage/perfschema/pfs.cc:1862

#25 0x00007f035ef19494 in start_thread (arg=0x7f0352575700) at pthread_create.c:333

#26 0x00007f035d2ff93f in clone () from /lib/x86_64-linux-gnu/libc.so.6