So, I've made my server where my main world generates using the Terra Default generator, I use PurPur-1151 and, when I generate new chunks, I get this spammed for a couple of seconds and sometimes it crashes too.
What could be causing this? How could I fix it?

Warn which Terra spammed

I'm using Terra 5.3.3 BETA, the last Spigot version available, and I don't know how to reproduce, because I don't know what causes this issue.