we recently created various sub-categories under the Specifications top-level category to make it easier to navigate to particular topics. This had the unintended effect that you are not automatically subscribed to those new sub-categories, i.e. you are not watching them. That means that posts you may be interested in will not by default generate an email to you.
Please visit the specifications category and make sure you are watching / tracking etc each sub-category according to your actual preferences This is essential for email communications to function properly.
Sorry for the trouble - we are still learning new lessons with Discourse…! As always, feel free to provide feedback in the Feedback category.