Pipelines in pull requests don't trigger on all commits

[Janneman Nortje]

We have a problem where an open Pull Requests's pipeline does not trigger on every commit to the source branch.The pipeline config looks like this:

pipelines:

pull-requests:

"**":

 - parallel:

 - step: *set-version

 - step: *frontend-build-library

and then the step details (there's many, but here is one of them's details:

- step: &frontend-build-library

name: Build frontend libraries

caches:

 - nodecustom

 - yarn

script:

 - yarn

 - yarn build:libs

artifacts:

 - "dist/**"

As you can see only some pipelines got tiggered for commits. The top one was triggered manully through the UI on the source branch. Any idea what we can look for? 

[Janneman Nortje · Accepted solution]

In the end we closed and created a new PR and that one seems to work as designed. So still not sure what the root cause was but we can carry on this way.