MySQL ON UPDATE CURRENT_TIMESTAMP not updating on boolean / enum changes

I've got this table:

CREATE TABLE `users` (
  `id` varchar(36) COLLATE utf8mb3_unicode_ci NOT NULL DEFAULT 'uuid-will-be-generated',
  `createdAt` timestamp NOT NULL DEFAULT (now()),
  `updatedAt` timestamp NOT NULL DEFAULT (now()) ON UPDATE CURRENT_TIMESTAMP,
  `username` varchar(60) COLLATE utf8mb3_unicode_ci NOT NULL DEFAULT '',
  `email` varchar(256) COLLATE utf8mb3_unicode_ci NOT NULL DEFAULT '',
  `realName` varchar(60) COLLATE utf8mb3_unicode_ci NOT NULL DEFAULT '',
  `password` varchar(256) COLLATE utf8mb3_unicode_ci NOT NULL DEFAULT 'no-password-specified',
  `passwordType` enum('bcrypt') COLLATE utf8mb3_unicode_ci NOT NULL DEFAULT 'bcrypt',
  `useAsDisplayName` enum('username','email','realName') COLLATE utf8mb3_unicode_ci NOT NULL DEFAULT 'username',
  `admin` tinyint(1) NOT NULL DEFAULT '0',
  `developer` tinyint(1) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  UNIQUE KEY `usernameIndex` (`username`),
  UNIQUE KEY `emailIndex` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_unicode_ci

And if I update any varchar the updatedAt field updates. But if I update an enum/boolean field then it doesn't. I know it won't update if the data in an update is the same, but the data is different and it doesn't update. Using MySQL 8.0.32.

Anybody have any ideas?

It turns out it was my app not MySQL. I should have checked at a lower level.