Pipeline for merge requests split up into two

Currently I’m having some issues with our CI configuration.
My goal was to add a specific job to merge request pipelines but I ended up having two pipelines where the first one contains the common jobs I want to execute and the second one only the specific job I wanted to add for merge requests.

This is my (trimmed down) .gitlab-ci.yml file:

stages:
  - init
  - build
  - testing
  - deploy

versioning:
  stage: init
  # ...
  allow_failure: false

build-release-x64:
  stage: build
  # ...
  dependencies:
    - versioning
  allow_failure: false

build-release-x86:
  stage: build
  # ...
  dependencies:
    - versioning
  allow_failure: false

.testsuite:
  stage: testing
  tags:
    - testsuite
  # ...
  dependencies:
    - build-release-x86
    - build-release-x64
  allow_failure: false

testsuite-merge-requests:
  extends: .testsuite
  # ...
  only:
    - merge_requests
  except:
    - testing
    - master

I expected the following pipeline to execute for the non-merge-request scenario:
versioning -> (build-release-x86 + build-release-x64)

I expected the following pipeline to execute for the merge-request scenario (except for merge requests in with source branch testing or master):
versioning -> (build-release-x86 + build-release-x64) -> testsuite-merge-requests

Unfortunately I ended up having this:

The two bubbles on the bottom pipeline are versioning and the build-release-* jobs, the pipeline on the top contains only the testsuite-merge-requests job.

Does anyone of you spot the mistake I made?

Hi

I have the same behaviour in my pipeline. Did you find a way to “not split” the pipeline?
It makes the merge request confusing.

How-to know if in pipeline.yml (YAML) is:

Pull-Request
or
Merge-Request
or
Create Branch

only-except is obsolete ?
only:
- merge_requests
except:
- testing
- master