Unfortunately this is quite common. At my 60 day mark I normally have 2 or 3 devices logged into MDE because I never know which one is actually going to recognize that my 60 day date has arrived.
There was a bug introduced sometime last week that wasn't working when you searched full availability of restaurants on the website. If you go into the individual restaurant you want it will work.
ETA: It was working properly 11 days ago when the first half of our split stay started and then broke a couple of days after that.
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