When a job has two or more dependencies, it isn't downloading at specified order

Summary

When a job has two or more dependencies, it isn't downloading at specified order.

Steps to reproduce

Expand for `.gitlab-ci.yml` sample code

stages:
 - build
 - pack

build-server:
 stage: build
 script:
  - yarn install
  - yarn server:build
 artifacts:
  paths:
   - "$CI_PROJECT_DIR/artifacts/"

build-client:
 stage: build
 script: 
  - yarn install
  - yarn client:build
 artifacts:
  paths:
   - "$CI_PROJECT_DIR/artifacts/"

pack-app:
 stage: pack
 dependencies:
  - build-server
  - build-client
 script:
  - yarn install
  - yarn docker:image:build
  - yarn docker:image:publish

Aditional Information: Always build-server is finished before build-client.

What is the current bug behavior?

During the pack-app job output, it's downloading first the artifacts from build-client.

Downloading artifacts for build-client (161831)...
Downloading artifacts from coordinator... ok        id=161831 responseStatus=200 OK token=hgqy37n1
Downloading artifacts for build-server (161832)...
Downloading artifacts from coordinator... ok        id=161832 responseStatus=200 OK token=qibAXas4

What is the expected correct behavior?

The artifacts must be downloaded at same order specified at dependencies configuration of te job.

Downloading artifacts for build-server (161832)...
Downloading artifacts from coordinator... ok        id=161832 responseStatus=200 OK token=qibAXas4
Downloading artifacts for build-client (161831)...
Downloading artifacts from coordinator... ok        id=161831 responseStatus=200 OK token=hgqy37n1

Output of checks

This bug happens on GitLab EE on premisse, version 11.7.5-ee