This still hasn't been fixed, in fact the OSL-PRG availability has now also disappeared; I don't know whether other destinations are zeroed out on Young availability as I am looking specifically for flights to PRG. It is frustrating since the revamped SAS Young proudly promises "discounts on all SAS flights" along with decent change conditions. After a lengthy fight with the useless chatbot, I finally managed to get through to a human customer service agent that promised to escalate it within the relevant department but let's see whether it actually amounts to anything.