Dragonfly is unrelated to bamboo. There is likely a pond or lake nearby. Water is where they breed and are hatched. They may come to your place because there is food, tiny flying insects such as mosquitos.
I try to cut bamboo at ground level, or even a little below. Just above and internode. I'm afraid of stepping on them and hurting my feet.

OK thanks for the tip

1 aren't the dragonflies a joy to watch?
2 don't leave stubs, the toes you save may be your own.
3 stubs can hold water long enough for a hatch of mosquitos.
If for some reason you can't get to a stub to cut it off because you would injure surrounding culms what I have been doing is splitting it down the middle so it can't hold water.