Why is this no longer an option when browsing?

Some of the sorting options are missing as of today. A blue already said it's being looked into and is not intentional.

Link to the specific post mentioned above

It keeps amazing me what GOG keeps pushing to prod without testing.

They really need to fix it or bring it back the option to hide owned games on the sales promo pages, if it was intentional.

I also can no longer even tell which games I own anymore when I view the sales pages. It no longer marks games as owned on the sales pages.
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GoG is just an ongoing construction site. Things sometimes work, sometimes not. One time I had 0 games in my library and an hour later they were back. Galaxy has the exact same behaviour...