[ubuntu] How to report bug agains snap package?

Hi,
on Ubuntu 16.04 I can report bug against official package by using:
ubuntu-bug <package_name>

How to report a bug against snap package?

1. Before installing any snap package, check default /snap directory:

drwxr-xr-x 2 root root 4096 jun 27 19:38 bin
drwxr-xr-x 3 root root 4096 jun 26 08:48 ubuntu-core total 0

2. Install hello-world snap:

3. Repeat step 1:
drwxr-xr-x 2 root root 4096 jun 27 19:44 bin
drwxr-xr-x 3 root root 4096 jun 27 19:44 hello-world
drwxr-xr-x 3 root root 4096 jun 26 08:48 ubuntu-core
-rwxr-xr-x 1 root root 601 jun 27 19:44 hello-world
-rwxr-xr-x 1 root root 580 jun 27 19:44 hello-world.echo
-rwxr-xr-x 1 root root 576 jun 27 19:44 hello-world.env
-rwxr-xr-x 1 root root 580 jun 27 19:44 hello-world.evil
-rwxr-xr-x 1 root root 572 jun 27 19:44 hello-world.sh
-rwxr-xr-x 1 root root 592 jun 27 19:44 hello-world.showdev
-rwxr-xr-x 1 root root 584 jun 27 19:44 hello-world.usehw

4. You can test the snap:

and
Hello World!
is displayed in terminal.

5. Remote snap package:

6. Check if remove was successful:
total 0 drwxr-xr-x 2 root root 4096 jun 27 19:46 bin
drwxr-xr-x 2 root root 4096 jun 27 19:46 hello-world
drwxr-xr-x 3 root root 4096 jun 26 08:48 ubuntu-core

Note: It is clear there was hello-world directory not removed.

total 0

Note: And directory is empty.

It looks like a bug.

How to report a bug against "hello-world" snap package?

Thanks