Here's a bug report:
When using slayer as the default minigame for a gamemode, leaving the minigame somehow breaks stuff. Like, If the minigame has lives, you still have lives. You still get the tools from the minigame. You can kill people and they can kill you. You can't respawn with F7 either. You can't join the minigame, it will say that you're already in.
To reproduce simply use slayer as the default minigame for a gamemode, seems to happen in every server.
I couldn't find your bug report page so I have no idea whether you're already working on this