'column not found' error if FK constraint references column that name has uppercase letters (MySQL) about tbls HOT 3 CLOSED

mysql> SELECT VERSION();
+-----------+
| VERSION() |
+-----------+
| 8.0.19    |
+-----------+
1 row in set (0.00 sec)

mysql> CREATE DATABASE `issue-255` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected, 1 warning (0.01 sec)

mysql> USE `issue-255`;
Database changed
mysql> CREATE TABLE table1 (productCode INT PRIMARY KEY);
Query OK, 0 rows affected (0.01 sec)

mysql> CREATE TABLE table2 (productCode INT, FOREIGN KEY(`productCode`) REFERENCES table1(`productcode`));
Query OK, 0 rows affected (0.03 sec)

mysql> SHOW CREATE TABLE table1;
+--------+--------------------------------------------------------------------------------------------------------------------------+
| Table  | Create Table                                                                                                             |
+--------+--------------------------------------------------------------------------------------------------------------------------+
| table1 | CREATE TABLE `table1` (
  `productCode` int NOT NULL,
  PRIMARY KEY (`productCode`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+--------+--------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SHOW CREATE TABLE table2;
+--------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table  | Create Table                                                                                                                                                                                                                     |
+--------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| table2 | CREATE TABLE `table2` (
  `productCode` int DEFAULT NULL,
  KEY `productCode` (`productCode`),
  CONSTRAINT `table2_ibfk_1` FOREIGN KEY (`productCode`) REFERENCES `table1` (`productCode`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+--------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql>