Note: It's highly recommended to test the plugin before using it on your server. Although I tested it a lot and I didn't find any bugs, it isn't 100% confirmed that you will not find any problems.

Well, finally, after half a century I am going to post the update.
I will begin with the most interesting things.
Features:
Now right-clicking a shulkerbox in your inventory will open it:
It will temporarily switch the item in your hand with the shulkerbox. It could have been made so this wasn't necessary but that would have probably caused many bugs.
The expression '%itemname%' can be used in the config.yml file to represent the item name:
This supports color codes.
The configuration file is better:​

Bugfixes:
You can now use hotbar shortcuts:
Yes, this was a thing.
No more duping:
Implemented multiple methods to prevent players from duping items.
Color shulkerboxes now work:
Finally.
Illegal nesting is not a thing anymore:
Fixed illegal nesting bugs.

Other changes:
Code refactor:
Improved code quality and readability compared to previous versions.


If you want to request a feature or report any bugs, please join my Discord server or DM me (But I will probably reply faster if you contact me via Discord, I check it daily)​