Chunk reverting all at once and not little by little

[Guerout-Arnaud]

What steps will reproduce the problem?

1. Create a new town
2. Claim some lands
3. Build on the land (in our test case it was a stone cube made by World Edit, First time it did it it was with a city that has been deleted, causing the server to crash (more than 200 claims to revert))
4. Unclaim lands or delete town

What is the expected output?

1. Chunk should be reverted little by little

What is your Towny version?

towny-0.95.2.20

What is your spigot/craftbukkit version?

git-Paper-77 (MC:1.15)
(sorry if it's not whas asked)

Please use Pastebin.com to link the following files:

Skipping these files is not an option. It is the easiest way to diagnose an issue ticket properly. If you do skip this step then your ticket will most likely be deleted and you will be asked to resubmit.

1. Your full server startup from the logs\latest.log :
   https://pastebin.com/tdcvq9RJ

2. Your Towny config.yml (if using MySQL please remove password,) :
   https://pastebin.com/r5Sh0zyp

3. Your townyperms.yml :

4. Your log's error :
   https://pastebin.com/WzANMyXG
   As you can see not so much to see