Repository import fails with "Cannot modify association"

Summary

We are trying to export/import a GitLab repository from one host to another. Unfortunately the import fails with the following import status:

"Error importing repository into <namespace>/<projectname> - Cannot modify association 'MergeRequest#suggestions' because the source reflection class 'Suggestion' is associated to 'Note' via :has_many."

Source version: 11.11.3 (Community Edition)

Destination version: 11.11.3-ee

Steps to reproduce

Export a project where a MR contains a suggestion and try importing it.

What is the current bug behavior?

Import status changes to: "Error importing repository into / - Cannot modify association 'MergeRequest#suggestions' because the source reflection class 'Suggestion' is associated to 'Note' via :has_many."

What is the expected correct behavior?

Import status is finished.

Results of GitLab environment info

Expand for output related to source GitLab environment info

* System: Debian 9.9 * Using RVM: no * Ruby Version: 2.5.3p105 * Gem Version: 2.7.9 * Bundler Version:1.17.3 * Rake Version: 12.3.2 * Redis Version: 3.2.12 * Git Version: 2.21.0 * Sidekiq Version:5.2.7 * Go Version: go1.7.4 linux/amd64

• GitLab information
• Version: 11.11.3
• Revision: e3eeb779
• Directory: /opt/gitlab/embedded/service/gitlab-rails
• DB Adapter: PostgreSQL
• DB Version: 9.6.11

Expand for output related to destination GitLab environment info

* System:        Ubuntu 18.04
* Proxy:        no
* Using RVM:    no
* Ruby Version:    2.5.3p105
* Gem Version:    2.7.9
* Bundler Version:1.17.3
* Rake Version:    12.3.2
* Redis Version:    3.2.12
* Git Version:    2.21.0
* Sidekiq Version:5.2.7
* Go Version:    unknown
* 
* GitLab information
* Version:    11.11.3-ee
* Revision:    8c5c506955e
* Directory:    /opt/gitlab/embedded/service/gitlab-rails
* DB Adapter:    PostgreSQL
* DB Version:    9.6.11
* Elasticsearch:    no
* Geo:        no