First, we apologize for the delay in circling back to this issue.
While we are continuing to look into this and other related issues that have arisen, we want to provide some additional information that we hope will help.
With the API rework it was intended for the entire account’s collection to be returned for any player, but this is no longer the case.
While this is correct, with changes made in support of the World of Warcraft 8.3.7 update, the Character Collections Mount Summary API was modified with the intention of better representing the mounts that are available as well as actually usable at the character level while continuing to maintain the Account Mounts Collection Summary API as a holistic view of the mounts collected at the account level. One of these changes was the addition of an “is_useable” boolean, as well as the addition of an “is_character_specific” boolean, on each mount in the Character Collections Mount Summary document where they apply.
We’ve since discovered that some unintended changes may have also been introduced, and we continue to evaluate the scope and impact of these changes. Additionally, we realize that we failed to communicate the intended changes, and failed to recognize the unintended changes, and for that, we apologize.
As we know now, an unintended change introduced with the World of Warcraft 8.3.7 update is that when a player logs out of World of Warcraft for the first time on a character which hasn’t played since the update was released, the Character Collection Mount Summary documents for other characters on that player’s account will become unavailable until those specific characters also experience a logout. At this time, we are advising that API consumers encourage users who may be experiencing this issue to log their characters out of World of Warcraft, which will cause these documents to once again become available.
We will continue to investigate the additional issues that have been communicated in this thread and provide an update when we have one.
Thank you for the feedback and reports.