I've updated the environment info - we're using BlueOcean 1.23.0. I have tried downgrading Pipeline: Multibranch to 2.20 and Pipeline: Multibranch Defaults to 2.0, but it didn't fix it. I have a feeling it's another plugin is causing this issue but I can't seem to find which one.
Liam Newman Yes - we do have multibranch-defaults-plugin installed (as marked in the issue description) and we are specifically using the part of loading `Jenkinsfile`s using `Managed Files` on some of our jobs.
[~bitwiseman] Yes - we do have multibranch-defaults-plugin installed (as marked in the issue description) and we are specifically using the part of loading `Jenkinsfile`s using `Managed Files` on some of our jobs. I've actually tried removing the plugin just now and confirm it's part of the problem.