TF Announcer of the TF2 Official Blog writes:
"We have sounded the alert and released a quick fix for an exploit that some unscrupulous players were using to wield items on invalid classes. I have considered an appropriate punishment for the good-for-nothings responsible for this horrendous breach of conduct. Death, of course - but death is too good for disappointments such as these. Instead, their unlockable items have been removed for a month."