I have noticed this behaviour amongst beginner traders, in any bull market period you can make plenty money without being knowledgeable about trading, the hard part is once this period ends and you continue trading, you'll start losing.
..and I am not sure under which category this behaviour falls in. Is it impatience, greed or fomo?
In crypto trading, nobody has the ultimate knowledge of the crypto market in totality, even the expert traders losses whether during the bear or bull runs respectively. Some times everyone seems to be a winner during the bull but that does not means that only the newbies encountered losses, it is a generally scenario especially if there is market dumps
Now, there are traders who are highly experienced on trading, it is not difficult for some of this traders to earn profit during the bear run. It is therefore good to learn the trading skills to boost your experience.
Again, impatient, FOMO, greed, are not necessarily the reason for losses but it is basically the lact of experience and good knowledge of the market.