Hello,
I know that a specific section exists, but this plugins is refused because it is not popular enought..
However, the "SchematicBrush" plugin already existing is obsolete for new versions (1.15 and +) and my server is in 1.16.5 
It is for this reason that i propose to you this plugin which has been redone, and updated for new versions of minecraft.
The download is direct using the Spigot site.
The URL : https://www.spigotmc.org/resou…matic-brush-reborn.79441/
It would be wise to replace the old one or add with this one.
Respectfully,
Nicolas (FR)