Invalid Form Key Error For Magento 2.3

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Thanks to [REDACTED] from [REDACTED], we found a bug on Magento 2.3. This happens on the cache management page when the form is submitted. An easy fix was suggested by Josh and it includes pasting <?php echo $block->getBlockHtml ("formkey") ?> inside every form element.

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This will be implemented today and tested for backwards compatibility with 2.0.x, 2.1.x, 2.2.x, and 2.3.x.

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Test the following versions of Magento:

• Magento 2.0.x (PHP-5.6)
• Magento 2.1.x (PHP-7.1)
• Magento 2.2.x (PHP-7.1)
• Magento 2.3.x (PHP-7.2)