git rev-list working locally but failing in pipeline

Question

I have a stage in my pipeline like below:

stage("Pre Flight Checks") {
            steps {
                echo 'using the message count externally'
                script {
                    // Execute the shell command and assign the result to an environment variable
                    def messageCount = sh(script: "git rev-list origin/${env.DEV_BRANCH_NAME}..origin/${env.BRANCH_NAME} --oneline | wc -l", returnStdout: true).trim()
                    env.message_count = messageCount
                }
                echo "message_count: ${env.message_count}"
                preFlightChecks()
            }
        }

I have defined few validations in my dsl lib function preFlightChecks() to run some checks. Here is the problem i am getting:

13:35:52  + git rev-list origin/develop..origin/release_10122024_1 --oneline
13:35:52  fatal: ambiguous argument 'origin/develop..origin/release_10122024_1': unknown revision or path not in the working tree.
13:35:52  Use '--' to separate paths from revisions, like this:
13:35:52  'git <command> [<revision>...] -- [<file>...]'
13:35:52  + wc -l

I am trying to identify the number of commit differences between the 2 branches and parse the logic based on that value.

while the same command works fine when i am running locally. works intermittently over the CI. How to understand this behaviour? i am clueless !! dear experts please provide your inputs.