I had no problem booking hkg-tlv but I spent 1.5 hours on the phone with a supervisor trying to get the bkk-tlv which would have been much more convenient. she put me on hold half a dozen times and told me she spoke to every department and they are aware of the situation but can do nothing about it as of now and I will have to call back to try to switch it to the bkk-tlv trip.
It seems to only be some days and some routes that dont work, and more often the hkg and bkk routes, because all the european flights were wide open as expected from expertflyer.