Design Management no longer accessible after Update to 12.5 (on Ultimate plan)

Summary

After updating our self-managed Gitlab-EE instance to 12.5.0, the Designs tab is no longer visible for any issue, even those for which designs have already been uploaded prior to the update. We are using an Ultimate plan, so the tab should be available.

Steps to reproduce

We just updated our instance from 12.4.3 to 12.5. LFS is globally enabled and also enabled for the projects in question.

We are using the Omnibus version of Gitlab-EE.

Example Project

What is the current bug behavior?

When accessing the issue, the Designs tab is no longer visible, neither is the Discussion tab:

However, the activity list still mentions the designs:

What is the expected correct behavior?

Before, the issue page looked like this:

Output of checks

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:   2.6.3p62
Gem Version:    2.7.9
Bundler Version:1.17.3
Rake Version:   12.3.3
Redis Version:  3.2.12
Git Version:    2.22.0
Sidekiq Version:5.2.7
Go Version:     unknown
GitLab information
Version:        12.5.0-ee
Revision:       4878f9ac894
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     10.9
URL:            https://gitlab.hpi3d.de
HTTP Clone URL: https://gitlab.hpi3d.de/some-group/some-project.git
SSH Clone URL:  git@gitlab.hpi3d.de:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     no
Using Omniauth: yes
Omniauth Providers:
GitLab Shell
Version:        10.2.0
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 10.2.0 ? ... OK (10.2.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Reply by email is disabled in config/gitlab.yml
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab App ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
8/4 ... yes
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224/517 ... yes
6/518 ... yes
229/519 ... yes
218/520 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.3)
Git version >= 2.22.0 ? ... yes (2.22.0)
Git user has default SSH configuration? ... yes
Active users: ... 142
Is authorized keys file accessible? ... yes
Elasticsearch version 5.6 - 6.x? ... skipped (elasticsearch is disabled)
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished

Fixes

To re-enable Design Management now

(From #37069 (comment 257824241)) To re-enable Design Management you will need to disable the design_management_require_hashed_storage feature flag.

To do this, an admin can use the gitlab-rails runner command:

sudo gitlab-rails runner "Feature.disable(:design_management_require_hashed_storage)"

Design Management will soon support legacy storage

We are in the process of supporting legacy storage in Design Management which will allow us to revert !19259 (merged) and remove the requirement of having hashed storage in order to use Design Management. See this discussion thread #13428 (comment 257828905).