Generation Error: Random Tall Wall

I randomly saw this generation error while exploring my world. It isn't game breaking or anything like that, but it does seem like a bug.

It is an error because even some of the roses are on top of one another

 

Edit 1:

The seed is 596829723, I tried recreating it but didn't work.

 

Edit 2:
I opened up my world again but the error structure was now gone. ???