Description (REQUIRED)

If a player got muted, the player won't be teleported after clicked the elevator interface.
Meanwhile, the player will send a message start with "written_book:open - ".
I suggest the CustomBookListener can change to command based system instead of chat one.

Steps to reproduce the Issue (REQUIRED)

Mute a player, and made the player to use elevator plate.

Expected behavior (REQUIRED)

The player should be teleported to the selected floor.

Environment (REQUIRED)

• Server Software (Spigot/Paper):Paper
• Minecraft Version:1.16.2
• Slimefun Version:DEV 648
• CS-CoreLib Version:DEV 90

That sounds more like your mute plugin doing something strange to chat messages, normally this should trigger anyway.
And changing this to a command-based approach wouldn't work as it would only cause much more problems like this.

We used to have it as a command and got a ton more bug reports than having it as a message without the slash.

The mute plugin in installed on Bungeecord, maybe it cancelled the event first.

CS-CoreLib should still process the event even if it's cancelled.