There's a bug on my server since this plugin is installed.

After destroying the tc & replacing it after the raid is done, decaying is broken.

Only the stuff placed by the raider is decaying, the raided guy placed stuff does not decay anymore and the base stays forever with the tc placed.

Sounds like you have encountered a normal feature of rust.

When a TC is destroyed, all current blocks will have up to 24 hours upkeep added to them, how long will be determined by what was left in the tc.

If there was at least 24 hours of resources in the tc when it was destroyed, the current base (Not new additions) will not decay until 24 hours have passed.