Protocol::end_statement(): Assertion `0' failed after insert into xmltype union of valid and invalid xml

CREATE TABLE t1(x XMLTYPE);

INSERT INTO t1 SELECT '<a/>' UNION SELECT 'a';

DROP TABLE t1;

mariadbd: /12.3/src/sql/protocol.cc:639: void Protocol::end_statement(): Assertion `0' failed.

260512 15:52:59 [ERROR] /12.3/bld/sql/mariadbd got signal 6 ;

Server version: 12.3.2-MariaDB-asan-debug-log source revision: 181f13ec49fdf14a873e9ebf7440133b3e0d70d9

libc_sigaction.c:0(__restore_rt)[0x7ba5e5445330]

nptl/pthread_kill.c:44(__pthread_kill_implementation)[0x7ba5e549eb2c]

posix/raise.c:27(__GI_raise)[0x7ba5e544527e]

stdlib/abort.c:81(__GI_abort)[0x7ba5e54288ff]

intl/loadmsgcat.c:1177(_nl_load_domain)[0x7ba5e542881b]

/lib/x86_64-linux-gnu/libc.so.6(+0x3b517)[0x7ba5e543b517]

sql/protocol.cc:640(Protocol::end_statement())[0x5de9065ad429]

sql/sql_parse.cc:2453(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool))[0x5de9068eab61]

sql/sql_parse.cc:1437(do_command(THD*, bool))[0x5de9068ec706]

sql/sql_connect.cc:1503(do_handle_one_connection(CONNECT*, bool))[0x5de906dad4bc]

sql/sql_connect.cc:1415(handle_one_connection)[0x5de906dad9a1]

asan/asan_interceptors.cpp:234(asan_thread_start(void*))[0x7ba5e645ea42]

nptl/pthread_create.c:447(start_thread)[0x7ba5e549caa4]

x86_64/clone3.S:80(clone3)[0x7ba5e5529c6c]

Query (0x52d00017c448): INSERT INTO t1 SELECT '<a/>' UNION SELECT 'a'