[Bug]: 'Ghost' notification. Only disappearing when killing mako process

I'm experiencing notifications that stay on the screen and can't be dismissed by clicking on them or by using `makoctl dismiss`. Journalctl has as only logs `mako[2191]: no buffer available` at the time of that notification. Sending new notifications through applications or `notify-send` from libnotify don't even show up anymore. It's like mako's process has hanged and is stuck.

This only happens when I'm inside a fullscreen application like a game. So I imagine it has to do with that.
The notifications triggered from Discord on another monitor.

Steps to reproduce (which I hope is reproducible)
1. Be inside a fullscreen application (in my case Final Fantasy 14)
2. Have a notification get triggered
3. After closing the fullscreen app, the notification is there but can't be interacted with.

I have experienced this in both KDE (wayland) and Niri.

My mako config:
```ini
default-timeout=5000
ignore-timeout=1
group-by=app-icon

[urgency=high]
border-color=#bf616a
default-timeout=0
```