Crash with PARTITION BY LIST and extended characters

SET NAMES utf8;

CREATE OR REPLACE TABLE t1 (a CHAR(10)) CHARACTER SET latin1 PARTITION BY LIST COLUMNS (a) (PARTITION p0 VALUES IN ('Б'));

SET NAMES utf8;

CREATE OR REPLACE TABLE t1 (a TIME) PARTITION BY LIST COLUMNS (a) (PARTITION p0 VALUES IN ('Б'));

SET NAMES utf8;

CREATE OR REPLACE TABLE t1 (a TIME) PARTITION BY LIST COLUMNS (a) (PARTITION p0 VALUES IN (_ucs2 0x0411));

#0  0x000000000070da12 in Item::fix_fields_if_needed (this=0x0, 

    thd=0x7fff68000d60, ref=0x0)

    at /home/bar/maria-git/server.10.4/sql/item.h:956

#1  0x0000000000d19a6f in convert_charset_partition_constant (item=0x0, 

    cs=0x1df7180 <my_charset_latin1>)

    at /home/bar/maria-git/server.10.4/sql/sql_partition.cc:149

#2  0x0000000000d1e7fd in add_column_list_values (str=0x7ffff41d4770, 

    part_info=0x7fff68015078, list_value=0x7fff68015378, 

    create_info=0x7ffff41d59b0, alter_info=0x7ffff41d58f0)

    at /home/bar/maria-git/server.10.4/sql/sql_partition.cc:2431

#3  0x0000000000d1ed62 in add_partition_values (str=0x7ffff41d4770, 

    part_info=0x7fff68015078, p_elem=0x7fff680152b8, 

    create_info=0x7ffff41d59b0, alter_info=0x7ffff41d58f0)

    at /home/bar/maria-git/server.10.4/sql/sql_partition.cc:2527

#4  0x0000000000d1f86e in generate_partition_syntax (thd=0x7fff68000d60, 

    part_info=0x7fff68015078, buf_length=0x7ffff41d4d3c, 

    show_partition_options=true, create_info=0x7ffff41d59b0, 

    alter_info=0x7ffff41d58f0)

    at /home/bar/maria-git/server.10.4/sql/sql_partition.cc:2753

#5  0x0000000000d1efcd in generate_partition_syntax_for_frm (

    thd=0x7fff68000d60, part_info=0x7fff68015078, buf_length=0x7ffff41d4d3c, 

    create_info=0x7ffff41d59b0, alter_info=0x7ffff41d58f0)

    at /home/bar/maria-git/server.10.4/sql/sql_partition.cc:2592

#6  0x00000000008f4291 in mysql_create_frm_image (thd=0x7fff68000d60, db=..., 

    table_name=..., create_info=0x7ffff41d59b0, alter_info=0x7ffff41d58f0, 

    create_table_mode=0, key_info=0x7ffff41d57f0, key_count=0x7ffff41d57ec, 

    frm=0x7ffff41d55d0)

    at /home/bar/maria-git/server.10.4/sql/sql_table.cc:4703

#7  0x00000000008f51b6 in create_table_impl (thd=0x7fff68000d60, orig_db=..., 

    orig_table_name=..., db=..., table_name=..., 

    path=0x7ffff41d55e0 "./test/t1", options=..., create_info=0x7ffff41d59b0, 

    alter_info=0x7ffff41d58f0, create_table_mode=0, is_trans=0x7ffff41d5877, 

    key_info=0x7ffff41d57f0, key_count=0x7ffff41d57ec, frm=0x7ffff41d55d0)

    at /home/bar/maria-git/server.10.4/sql/sql_table.cc:5042

#8  0x00000000008f5642 in mysql_create_table_no_lock (thd=0x7fff68000d60, 

    db=0x7fff68014318, table_name=0x7fff68014328, create_info=0x7ffff41d59b0, 

    alter_info=0x7ffff41d58f0, is_trans=0x7ffff41d5877, create_table_mode=0, 

    table_list=0x7fff68014300)

    at /home/bar/maria-git/server.10.4/sql/sql_table.cc:5145

#9  0x00000000008f5a12 in mysql_create_table (thd=0x7fff68000d60,