Jungwoo Im

It already does that. Are you sure that everything is shutting down properly? No errors or anything?

It seems like an issue with CMI. The dev will probably need to check if the box has successfully opened by listening for interactions with the inventory or cancellation of...

With use-own-inventory set to true, there isn't really a restoration process by Duels, so that can't be the issue. Could you check if players are able to open the box...

I was attempting to fix this but found no solution within the Bukkit API. Have you tried separating the arenas to a new world? I think it will work, but...

Since I don’t have CMI, I’ll have trouble implementing the feature myself. If you could join my discord server (http://discord.realized.me), I can send you a version with an attempted implementation...

There is most likely going to be an error on console or in Duels log (plugins/Duels/logs). Could you post it?

Thanks for the request! I don't think I can merge this due to recent changes I've made, but I'll take them into account for the next update.

What do you mean by "garbled code"?

Implemented in 5300ab7. Permission is `tokenmanager.cancel.-`

I see what you mean. It shouldn't be hard to implement your approach, but it'll need a better option name than `permission` since it's very likely to confuse people about...