Assertion `user_table->get_ref_count() == 1' failed upon OPTIMIZE on statistical table

--source include/have_innodb.inc

CREATE TABLE t (

  pk INT AUTO_INCREMENT,

  a INT,

  b DATETIME,

  c VARCHAR(1),

  PRIMARY KEY (pk ASC),

  KEY (a DESC),

  KEY (b ASC),

  KEY (c DESC, a ASC)

) ENGINE=InnoDB STATS_PERSISTENT=1;

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

--connect (con2,localhost,root,,)

--send

	OPTIMIZE TABLE t;

--connection con1

OPTIMIZE TABLE mysql.innodb_index_stats;

--connection default

OPTIMIZE TABLE mysql.innodb_index_stats;

DROP TABLE t;

mariadbd: /data/MDEV-33547/10.5/storage/innobase/handler/handler0alter.cc:10204: bool commit_try_rebuild(Alter_inplace_info*, ha_innobase_inplace_ctx*, TABLE*, const TABLE*, trx_t*, const char*): Assertion `user_table->get_ref_count() == 1' failed.

(rr) bt

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

#1  0x000004b612404859 in __GI_abort () at abort.c:79

#2  0x000004b612404729 in __assert_fail_base (fmt=0x4b61259a588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x558f7f5d6c00 "user_table->get_ref_count() == 1", 

    file=0x558f7f5d20b8 "/data/MDEV-33547/10.5/storage/innobase/handler/handler0alter.cc", line=10204, function=<optimized out>) at assert.c:92

#3  0x000004b612415fd6 in __GI___assert_fail (assertion=0x558f7f5d6c00 "user_table->get_ref_count() == 1", file=0x558f7f5d20b8 "/data/MDEV-33547/10.5/storage/innobase/handler/handler0alter.cc", 

    line=10204, function=0x558f7f5d9318 "bool commit_try_rebuild(Alter_inplace_info*, ha_innobase_inplace_ctx*, TABLE*, const TABLE*, trx_t*, const char*)") at assert.c:101

#4  0x0000558f7ec94955 in commit_try_rebuild (ha_alter_info=0x33021489f600, ctx=0x366520020ca0, altered_table=0x33021489f6a0, old_table=0x366520025578, trx=0x671338814468, 

    table_name=0x70b6400f725e "innodb_index_stats") at /data/MDEV-33547/10.5/storage/innobase/handler/handler0alter.cc:10204

#5  0x0000558f7ec82f3a in ha_innobase::commit_inplace_alter_table (this=0x366520025da0, altered_table=0x33021489f6a0, ha_alter_info=0x33021489f600, commit=true)

    at /data/MDEV-33547/10.5/storage/innobase/handler/handler0alter.cc:11313

#6  0x0000558f7e8cbb60 in handler::ha_commit_inplace_alter_table (this=0x366520025da0, altered_table=0x33021489f6a0, ha_alter_info=0x33021489f600, commit=true) at /data/MDEV-33547/10.5/sql/handler.cc:4951

#7  0x0000558f7e66c69e in mysql_inplace_alter_table (thd=0x36652000c968, table_list=0x36652001e618, table=0x366520025578, altered_table=0x33021489f6a0, ha_alter_info=0x33021489f600, 

    target_mdl_request=0x33021489fa90, alter_ctx=0x3302148a05e0) at /data/MDEV-33547/10.5/sql/sql_table.cc:8295

#8  0x0000558f7e674dd7 in mysql_alter_table (thd=0x36652000c968, new_db=0x558f7f3594f0 <null_clex_str>, new_name=0x558f7f3594f0 <null_clex_str>, create_info=0x3302148a11d0, table_list=0x36652001e618, 

    recreate_info=0x3302148a15b0, alter_info=0x3302148a10e0, order_num=0, order=0x0, ignore=false, if_exists=false) at /data/MDEV-33547/10.5/sql/sql_table.cc:11031

#9  0x0000558f7e67822c in mysql_recreate_table (thd=0x36652000c968, table_list=0x36652001e618, recreate_info=0x3302148a15b0, table_copy=false) at /data/MDEV-33547/10.5/sql/sql_table.cc:11995

#10 0x0000558f7e71d3c4 in admin_recreate_table (thd=0x36652000c968, table_list=0x36652001e618, recreate_info=0x3302148a15b0) at /data/MDEV-33547/10.5/sql/sql_admin.cc:65

#11 0x0000558f7e720764 in mysql_admin_table (thd=0x36652000c968, tables=0x36652001e618, check_opt=0x366520011c48, operator_name=0x558f7f3ac00e "optimize", lock_type=TL_WRITE, org_open_for_modify=true, 

    repair_table_use_frm=false, extra_open_options=0, prepare_func=0x0, operator_func=

    (int (handler::*)(class handler * const, class THD *, HA_CHECK_OPT *)) 0x558f7e8cb3bc <handler::ha_optimize(THD*, st_ha_check_opt*)>, view_operator_func=0x0, is_cmd_replicated=true)

    at /data/MDEV-33547/10.5/sql/sql_admin.cc:1148

#12 0x0000558f7e721ae6 in Sql_cmd_optimize_table::execute (this=0x36652001ed18, thd=0x36652000c968) at /data/MDEV-33547/10.5/sql/sql_admin.cc:1513

#13 0x0000558f7e57c040 in mysql_execute_command (thd=0x36652000c968) at /data/MDEV-33547/10.5/sql/sql_parse.cc:6159

#14 0x0000558f7e581c25 in mysql_parse (thd=0x36652000c968, rawbuf=0x36652001e510 "OPTIMIZE TABLE mysql.innodb_index_stats", length=39, parser_state=0x3302148a2390, is_com_multi=false, 

    is_next_command=false) at /data/MDEV-33547/10.5/sql/sql_parse.cc:8196

#15 0x0000558f7e56e2e1 in dispatch_command (command=COM_QUERY, thd=0x36652000c968, packet=0x366520016009 "", packet_length=39, is_com_multi=false, is_next_command=false)

    at /data/MDEV-33547/10.5/sql/sql_parse.cc:1891

#16 0x0000558f7e56cdd2 in do_command (thd=0x36652000c968) at /data/MDEV-33547/10.5/sql/sql_parse.cc:1375

#17 0x0000558f7e70946e in do_handle_one_connection (connect=0x558f81199178, put_in_cache=true) at /data/MDEV-33547/10.5/sql/sql_connect.cc:1415

#18 0x0000558f7e709201 in handle_one_connection (arg=0x558f81199178) at /data/MDEV-33547/10.5/sql/sql_connect.cc:1317

#19 0x00005ed0176c4609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#20 0x000004b612501133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95