1 of 20 buds dies?

[tedro]

Hi friends,

Of 20 buds, the 3rd to last open, 2 remaining to open, has partially opened and now appears kind of dry and slightly wrinkled, like that one has died or is dying.

Is it normal for only 1 to die halfway opened?

The others look fine and expect the last to open.
There was one anamoly: last night while turning the plant around, a nearby bamboo caught a flower and sheared half of one petal off -- however, that is not the flower that appears to be dead or dying.
images attached —- if this is gone, is it? i’m taking it off.