Filter by provider isn't working in my books

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Experiencing this on the Japanese side as well. Tried on both firefox and chrome, and attempted to filter using a bunch of different providers to no avail. It doesn’t work for any user lists, including my own.

This was working fine for me in My Books (I think), until yesterday. At the very least, it worked on the normal book search page

I haven’t been able to reproduce, is this still happening or it has been fixed at some point?

Still happening for me - I just tried with Japanese and Korean, and regardless of which provider is selected, it just shows all my books. After clicking the provider selection, it greys out the books as though it’s reloading, but when it returns the list doesn’t change (and the same number of books is shown at the top of the page). Plausible for Amazon JP, but not for providers with limited selections (Aozora, Storytel, Google Play).

Doesn’t work for me either

Besides sword art online, none of these have audiobooks, so none should display. Page refresh makes more difference