After username change, pipeline unable to pull registry image (unauthorized HTTP Basic: Access denied)

Summary

Hey, after changing username Lexinek -> JanMikes (temporarily reverting back to Lexinek because i was unable to solve this issue and it is critical to be able to run pipelines!

This is failing (repository is in group Apploud so it should be able to pull the image):

stages:
    - build

image: registry.gitlab.com/apploud/docker/webserver:latest

composer:
    stage: build
    script:
        - composer install --no-interaction --ansi --prefer-dist --optimize-autoloader --ignore-platform-reqs
    artifacts:
        paths:
            - vendor/
        expire_in: 24h

Steps to reproduce

Trigger a pipeline with image from private gitlab registry after changing username

Example Project

Tested on private repositories only.

What is the current bug behavior?

When runner is trying to pull image from private gitlab's docker registry it fails on Access Denied.

Does not work neither with shared or private self hosted runners

What is the expected correct behavior?

Image gets pulled and pipeline finishes successfully.

Relevant logs and/or screenshots

After username change:

Before (or after revert) username change:

Output of checks

This bug happens on GitLab.com