My last flight from AMS to Phuket with a layover in KUL, all in J for vacation...my priority tagged luggage didn't even make it. They only moved ~2/3rds of luggage from the KL 777-300 to the Malaysia Airlines plane, the rest arrived the next day. (luckily they only lost luggage this time and not the entire plane?)
"Happens all the time" according to the nice lady at the airport in Phuket
Suspected it coming, had a backpack/carry-on with stuff to 'survive' 2 days and once again proves my point to only travel with carry-on when doing business trips