Build on LXD in Fedora 28 fails

I am trying to troubleshoot LXD+snapcraft issue on Fedora 28 and can not get too far. LXD is installed from snap, I am in lxd group.

$ SNAPCRAFT_BUILD_ENVIRONMENT=lxd snapcraft        
Waiting for a network connection...
Network connection established
error: no changes of type "auto-refresh" found
Adding assertion core_4571.assert
Installing /run/core_4571.snap
error: cannot perform the following tasks:
- Mount snap "core" (4571) ([start snap-core-4571.mount] failed with exit status 1: Job for snap-core-4571.mount failed. See "systemctl status snap-core-4571.mount" and "journalctl -xe" for details.
Stopping local:snapcraft-gitless
The following command failed to run: 'snap install /run/core_4571.snap' exited with 1

$ systemctl status snap-core-4571.mount
Unit snap-core-4571.mount could not be found.
$ lxc exec snapcraft systemctl status snap-core-4571.mount
‚óŹ snap-core-4571.mount
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)
$ lxc exec snapcraft -- journalctl -xe | grep snap-core

Where to look next?