Since the collection was unrevealed until now, there are many works that were posted/published to AO3 earlier (prior to the work reveals date). But, when AO3 sorts works (for general users to find), its default mode is to sort by date, such that the most recently posted/published works appear at the top of the search queue. As a result, if there is a work in the collection that was posted/published to AO3 a month ago (for example), even though it will be revealed today, other users may not find it easily because it will be 'buried beneath' all the newer works that have been posted since.
To make it easier for other users to find the works you've posted to the collection, you can click on the work, select "Edit" in the top right corner, go to the "Associations" field, and then select the date (currently July 30 UTC) at the "Set a different publication date" checkbox. And then post the work again, just using the regular "Post" button at the very bottom right corner.
Hope this helped, please let me know if there is anything else I could clarify.
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To make it easier for other users to find the works you've posted to the collection, you can click on the work, select "Edit" in the top right corner, go to the "Associations" field, and then select the date (currently July 30 UTC) at the "Set a different publication date" checkbox. And then post the work again, just using the regular "Post" button at the very bottom right corner.
Hope this helped, please let me know if there is anything else I could clarify.