A simple project to show the bug when mentioning a role.
Add the token for the discord channel either to the config.exs or to config.secret.exs.
use Mix.Config
config :nostrum,
token: "replace_with_your_token"
The bot requires permission to read and write permissions.
After starting the bot send "!role" in a channel where he has access and he will create a test role and afterwards tries to mention this role in a reply. Finally he deletes that role.