When creating first menu link, it doesn't appear until the cache is cleared

I had the same issue and I got it working by adding this cache tag. I'm not sure if this is the correct place in code to add it though.

I'm also getting same issue. Must be somewhere menu is caching whenever it's created.

Steps to reproduce issue:

1. Install 8.x-1.x.dev & configure this module
2. Then create a new group menu under any group. Navigate to group page, you won't find any menu there.
3. After clearing all cache you will find menu is visible.