That was already the case yesterday. I could add the 5900X to the basket yesterday but not order, then later in the day I could click "add" but the basket would just show as empty, now I can add but not order again. I think this is going to be a stupid game until tomorrow.Just did a video call with customer support, and they have zero stock according to their systems anywhere in the country, and they're awaiting stock.
I did notice the 5950x could be added (well, it didn't work, but the button was there) to basket yesterday, and today the 5900x can be added to basket successfully, but not actually ordered