Gitlab-ci pipeline overview does not show "By API" on triggered pipelines

When adding a trigger on a (gitlab.com, private) project, and activating this trigger from another projects-pipeline (via curl -X POST -F “token=SpecificToken”), the triggered project build is started, but afterwards in overview they do NOT show “By Api” like mentioned in https://docs.gitlab.com/ee/ci/triggers/

It shows always last commit and “by last_commit_user” which is very confusing.