Several years in with a known fault and still neither a fix or, at the very least, a warning for players?
Even now if you cure your vamp or were disease without first respeccing ALL your skills you lose the points you spent on any skills. This has been an issue since day 1 - since I saw no update, comment or advice from ZOS on the subject I thought I'd test to see and yes... still broken.
At the minimum there should be a warning text in the cure dialogue to ask if you have respecced - if the company is lacking the skills to fix it then they should at least warn people OR give a respec as part of the cure.