The Harrier has certainly suffered from nozzle failures in the past, although not sure if it was whilst in the hover. I believe initially the front nozzles were fibreglass before being redesigned. The Harrier’s nozzles are also much nearer to the CofG, so any change of moment from an individual nozzle failure is likely to be less than the F35; however, the loss of a 1/4 of the summed lift vector is probably still going to result in an accident!