Hello. When I fill my world the server crash/ plugin crash.
2019-03-31-3.log here's log from paper, and here log from https://pastebin.com/A4DLXWXR from spigot

Great, I saw today bad chunks while traveling the world and. How to fix that? What I have to do? My backup from yesterday have 13.21GB and todays backup is 5.47...

and I have a issue, when I join server im getting teleported somewhere coords 8.5 y 8.5 and I have blue screen I mean I have clean chunks nothing visible, 5 seconds later I'm getting kicked with "disconnected" isn't that happen by WorldBorder? + when I have done my worldborder fill after restart I'm getting ~45% like before fill...

The error is effectively the same in both:
Caused by: java.util.concurrent.CompletionException: java.lang.RuntimeException: We are asking a region for a chunk out of bound | 97 151

Not the fault of WorldBorder, as per usual.

Looks like your world has a corrupt region file. Most likely caused by running out of disk space while the world was generating, but it could have been caused by other things.

A quick search led to:
http://koastal.world/exception-generating-new-chunk-a-detailed-fix-method/

My comment above pointed to a link detailing a fix.