Docker images are not moved and remain in the registry after a project transfer

Summary

I moved some projects to another parent (/group1 -> /new-group/group1 for example). Docker images just disappear after the move (first bug) and when i do gitlab-ctl registry-garbage-collect, they are always here but not removed (second bug) !

Steps to reproduce

Move project with docker images to a new parent.

What is the current bug behavior?

• Docker images disappear after the move
• Docker images disappear but gitlab-ctl registry-garbage-collect don't remove them !

What is the expected correct behavior?

• Docker images is displayed in Gitlab so I can continue to use it and manage them
• OR gitlab-ctl registry-garbage-collect remove them because they are not manageable anymore in Gitlab

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:         Ubuntu 18.04
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.4.4p296
Gem Version:    2.7.6
Bundler Version:1.16.2
Rake Version:   12.3.1
Redis Version:  3.2.11
Git Version:    2.18.1
Sidekiq Version:5.1.3
Go Version:     unknown
GitLab information
Version:        11.3.6-ee
Revision:       8d9cf17629c
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
DB Version:     9.6.8
URL:            https://example.org
HTTP Clone URL: https://example.org/some-group/some-project.git
SSH Clone URL:  git@example.org:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     no
Using Omniauth: no
GitLab Shell
Version:        8.3.3
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git