MySQL 8.0.16: Select Date LIKE query fails - mysql

Question

I have 3 MySQL/MariaDB servers running for application development and testing:
MySQL Community Server 5.7.32
MySQL Community Server 8.0.16
MariaDB Community Server 10.4.12
The servers are configured to run on different ports on the same machine.
SELECT ##sql_mode for all servers:
MySQL Community Server 5.7.32: NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
MySQL Community Server 8.0.16: STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION
MariaDB Community Server 10.4.12: NO_ZERO_IN_DATE,NO_ZERO_DATE,NO_ENGINE_SUBSTITUTION
I stumbled across some SELECT queries in old code I maintain whose fails to run, for e.g. searching a date with a given pattern. The queries look like this:
SELECT * FROM `userTable` WHERE `birthDate` LIKE '2020-%-%';
SELECT * FROM `userTable` WHERE `birthDate` LIKE '%12%';
The table looks like this:
CREATE TABLE IF NOT EXISTS `userTable` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` TEXT COLLATE utf8_unicode_ci,
`birthDate` DATE,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
When I run the queries on MySQL Community Server 8.0.16 they fail with the error Error Code: 1525. Incorrect DATE value: '2020-%-%'. and Error Code: 1525. Incorrect DATE value: '%12%'..
MySQL Community Server 5.7.32 and MariaDB Community Server 10.4.12 executes the queries successfully.
Why does MySQL Community Server 8.0.16 fails to execute these SELECT queries?
PS: The first SELECT query can be written as
SELECT * FROM `userTable` WHERE YEAR(`birthDate`) = 2020;
to run on all 3 servers.
EDIT: It's a bug in MySQL Community Server 8.0.16 and fixed in version 8.0.22.

Answer 1

You should be comparing a bona fide date column against valid date literals, not strings, e.g. to find records in 2020:
SELECT *
FROM userTable
WHERE birthDate >= '2020-01-01' AND birthDate < '2021-01-01'; -- sargable :-)
Or maybe:
SELECT *
FROM userTable
WHERE YEAR(birthDate) = 2020; -- not sargable though :-(