It seems that access to the Thesaurus Linguae Latinae has also expired: when one searches for a word, the website returns:

It seems that access to journal articles is working. On the other hand, books still display 'add to the cart' rather than 'read'.
In the 'Library' page, 'Your Library' shows only journals. I wonder if this means we are only granted journal access, and previous book access was revoked or perhaps had been granted mistakenly in the first place.

My bug report was merged here, but I don't think it's the same issue, since as late as 25 July, I was able to access ebooks, but by 31 July, it stopped working again.
Anyway, I wonder if there has been any progress.
Let me end by appreciating the hard work of running Wikpedia Library and its immense help to my research.