Can't change material in GUI, like in old version

[smscentras]

Server version

Purpur 1.21.8

Duels version

6.0

Describe the bug

In GUI I can't SET "kit-selector" and "arena-selector" --> material
like in "use-own-inventory"

You can find all in lang.yml file.
In old version was all ok.

Checklist

• I am running latest version of the plugin
• I have read the wiki to make sure it's not an issue with configuration
• I ticked all of the boxes without actually reading them
• I have read the Compatibility wiki page and am not trying to run the plugin on an unsupported server version / platform
• I am willing to cooperate to get this issue resolved faster, including providing any additional information requested or testing new builds

[dumbo-the-developer]

Added, update will be released soon