Hey ZaiquiriDaiquiri,
It is something that my colleagues are looking into and is something the Server Status Page notification was referring to. In the meantime, if you purchased it and re-logged, you should be able to find it all the way at the bottom of the Wards Collection page when looking through the "My Collection" selection:
https://imgur.com/Swg3unO
In Champ Select, similarly, you can locate the Pumpkin Cat Ward Skin all the way at the bottom of the list:
https://imgur.com/K4RCehC
Make sure not to attempt to craft it separately because you'll be able to. If you've already purchased it multiple times or still need assistance with it, please create a Support Ticket so my colleagues can take a further look into it: https://support.riotgames.com/hc/en-us/requests/new