25th anniversary subscription locked out early

I was working on the promotional content last night and my subscription has turned to a guest account even though the site itself still shows the promotion valid for 15+ hours at the point it removed the course from my account.

Has this happened to anyone else, why have they removed my access before the 25th if the promotion itself is still valid on the 25th?

Does it not make sense to keep access on the final day so we can get some final revision in if we wish?