None of the global page messages are appearing on any page in the admin panel. This includes and is not limited to my own custom messages, saving a product, canceling an order and clearing the cache.

I've tried with all caches enabled and disabled with no luck.

Some investigation has shown that I can get messages showing by adding $clear = false; in the getMessages() function in vendor/magento/framework/Message/Manager.php on line 120. This tells me that messages are being cleared on every redirect without allowing the latest added message to display.

I can't tell what happened to the system before I started seeing this bug.

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