10.11.17 regression: schema-qualified unquoted table name starting with digit fails to parse

CREATE DATABASE IF NOT EXISTS test2;

USE test2;

DROP TABLE IF EXISTS table1;

DROP TABLE IF EXISTS `1table`;

CREATE TABLE table1 (

  id INT NOT NULL PRIMARY KEY

);

CREATE TABLE `1table` (

  id INT NOT NULL PRIMARY KEY

);

INSERT INTO table1 VALUES (1);

INSERT INTO `1table` VALUES (1);

-- Works:

EXPLAIN SELECT * FROM test2.table1;

-- Fails in MariaDB 10.11.17:

EXPLAIN SELECT * FROM test2.1table;

ERROR 1064 (42000): You have an error in your SQL syntax;

check the manual that corresponds to your MariaDB server version

for the right syntax to use near '.1table' at line 1

-- Works:

EXPLAIN SELECT * FROM test2.`1table`;

-- Also works when current database is test2:

EXPLAIN SELECT * FROM 1table;