UBSAN failure seen in log_event.cc

UBSAN|load of value X, which is not a valid value for type 'Optional_metadata_field_type'|sql/log_event.cc|Table_map_log_event::Optional_metadata_fields::Optional_metadata_fields|RPL_TABLE_LIST::create_column_mapping|Rows_log_event::do_apply_event|Log_event::apply_event

test/main-MDEV-36290_dbg_san/sql/log_event.cc:3770:30: runtime error: load of value 105, which is not a valid value for type 'Optional_metadata_field_type'

    #0 0x587a27629adb in Table_map_log_event::Optional_metadata_fields::Optional_metadata_fields(st_mem_root*, unsigned int, unsigned char*, unsigned int, bool) /test/main-MDEV-36290_dbg_san/sql/log_event.cc:3770:30

    #1 0x587a286ed15d in RPL_TABLE_LIST::create_column_mapping(rpl_group_info*) /test/main-MDEV-36290_dbg_san/sql/rpl_utility_server.cc:1353:5

    #2 0x587a275b115b in Rows_log_event::do_apply_event(rpl_group_info*) /test/main-MDEV-36290_dbg_san/sql/log_event_server.cc:5117:14

    #3 0x587a2762bd71 in Log_event::apply_event(rpl_group_info*) /test/main-MDEV-36290_dbg_san/sql/log_event.cc:4002:8

    #4 0x587a286854cd in save_restore_context_apply_event(Log_event*, rpl_group_info*) /test/main-MDEV-36290_dbg_san/sql/sql_binlog.cc:188:16

    #5 0x587a28687058 in mysql_client_binlog_statement(THD*) /test/main-MDEV-36290_dbg_san/sql/sql_binlog.cc:428:14

    #6 0x587a27fe2193 in mysql_execute_command(THD*, bool) /test/main-MDEV-36290_dbg_san/sql/sql_parse.cc:5772:5

    #7 0x587a27fb7d48 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/main-MDEV-36290_dbg_san/sql/sql_parse.cc:7883:18

    #8 0x587a27fabcb1 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/main-MDEV-36290_dbg_san/sql/sql_parse.cc:1878:7

    #9 0x587a27fba76d in do_command(THD*, bool) /test/main-MDEV-36290_dbg_san/sql/sql_parse.cc:1417:17

    #10 0x587a287565dc in do_handle_one_connection(CONNECT*, bool) /test/main-MDEV-36290_dbg_san/sql/sql_connect.cc:1414:11

    #11 0x587a28755e97 in handle_one_connection /test/main-MDEV-36290_dbg_san/sql/sql_connect.cc:1326:5

    #12 0x587a26d6ae4c in asan_thread_start(void*) crtstuff.c

    #13 0x7ae7d169caa3 in start_thread nptl/pthread_create.c:447:8

    #14 0x7ae7d1729c6b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

BINLOG 'wlZOTw8BAAAA8QAAAPUAAAAAAAQANS41LjIxLU1hcmlhREItZGVidWctbG9nAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAA2QAEGggAAAAICAgCAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAA371saA==';

CREATE TABLE t1 (c CHAR,KEY c (c)) DEFAULT CHARSET=utf32;

binlog 'bBf2ZBMBAAAANAAAAHUkAAAAAHEAAAAAAAEABHRlc3QAAnQxAAQDDw8IBP0C4h0AaTGFIg==bBf2ZBgBAAAASAAAAL0kAAAAAHEAAAAAAAEABP//8I + kAAABAGIBAGWuv1VNCQAAAPBuWwAAAQBiAQBlrr9VTQkAAADxS9Lu';