I remember that the RAF used to circulate a magazine type document in which selected accident reports were reviewed. the idea being that both ground and aircrew, could learn from their errors.
One that sticks in my mind contained a photo of a reassembled pair of pliers which had been left in a jet intake and had subsequently passed through the engine. It had been very neatly chopped into about 8 pieces, but had not done the engines internals any favours either.

Returning to the OPs original question, I always understood that the German engines suffered from blades burning out because they did not have the exotic alloys to withstand the very high temperatures reached in a jet.