We are building pipeline with parallel workflow execution of unit tests. A script step is added to check for changed files in the specific modules. The script is working for pull request builds on Bitrise, but for merge builds I tried several options and always get the error from title. The script works locally also for merge commits, example of working code: CHANGED_FILES=“$(git diff --name-only HEAD^ HEAD)”. I also tried to use $BITRISE_GIT_BRANCH or $BITRISE_GIT_COMMIT environment variables, but gave me the same error. What I could understand from it that it might be because there is no branch history with what to compare the changes. Can you give me some hints how to proceed in this case?