I'm using a Multibranch pipeline with Branch Sources setup for Bitbucket.

Since migrating from Bitbucket Branch Source Plugin 2.2.8 to 2.2.9, if the script path for the Jenkinsfile is in a subfolder ( for example : _ci/Jenkinsfile.groovy) the file is no more found when scanning multibranch pipeline.

Here output of Scan multibranch pipeline log

2.2.9

Checking branch pipelinesTest from APPS/myProject '_ci/Jenkinsfile.groovy' not found Skipped

2.2.8

Checking branch pipelinesTest from APPS/myProject '_ci/Jenkinsfile.groovy' found Met criteria

I tested just reverting the Bitbucket Branch Source Plugin from 2.2.9 to 2.2.8 and it solves the issue.