My first Chromaticat still had some time left but just vanished tonight. I tried equipping my second cat and it also vanished. Both are missing entirely from my back pack.
Such a pity as I really enjoyed this particular mount. Hoping that the cat becomes available sometime soon as either crown or part of bundle. Sigh.
This just happened to me. I equipped the mount, which started the 90-day timer. I went from Olde Town to Triton Avenue-3 seconds-and the mount disappeared. A message read it had "expired." I may not be great at math, but even I know 90 days does not equal 3 seconds.