Repro Steps
None known; this just happened with no discernable trigger.
My wife is part of the Alpha (account = Minxie) and was able to complete this quest without issue.
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Expected Behaviour
Quest starts and game focus shifts to a room with a cat on a rug.
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Actual Behaviour
The game loaded into the new setting (the room with the cat on the rug) but only for a second before it reloaded into my previous screen. When I visit the Quest menu it shows I'm "already doing the quest" and the option to try it was greyed out.
Since the screen only showed the intended page for a second I wasn't able to read the details. I also had a quest called the Rainbow Run which never appeared even though I thought i'd triggered it.
imgur.com/3bmrN.png