Cannot configure gitlab connection nor gitlab triggering options via CASC

Jenkins and plugins versions report

Environment

``` Jenkins: 2.332 OS: Linux - 5.10.0-0.bpo.8-amd64 --- ace-editor:1.1 antisamy-markup-formatter:2.7 apache-httpcomponents-client-4-api:4.5.13-1.0 authentication-tokens:1.4 authorize-project:1.4.0 basic-branch-build-strategies:1.3.2 bootstrap4-api:4.6.0-3 bootstrap5-api:5.1.3-4 bouncycastle-api:2.25 branch-api:2.7.0 caffeine-api:2.9.2-29.v717aac953ff3 checks-api:1.7.2 cloudbees-folder:6.17 command-launcher:1.2 configuration-as-code:1.55.1 credentials:1074.v60e6c29b_b_44b_ credentials-binding:1.27.1 display-url-api:2.3.5 docker-commons:1.18 docker-workflow:1.27 durable-task:493.v195aefbb0ff2 echarts-api:5.2.2-2 envinject:2.4.0 envinject-api:1.8 extended-read-permission:3.2 font-awesome-api:5.15.4-5 git:4.10.3 git-client:3.11.0 git-server:1.10 gitlab-plugin:1.5.27 handlebars:3.0.8 jackson2-api:2.13.1-246.va8a9f3eaf46a javax-activation-api:1.2.0-2 javax-mail-api:1.6.2-5 jaxb:2.3.0 jdk-tool:1.0 jersey2-api:2.35-3 job-dsl:1.78.3 jquery3-api:3.6.0-2 jsch:0.1.55.2 junit:1.53 kubernetes:1.31.3 kubernetes-client-api:5.11.2-182.v0f1cf4c5904e kubernetes-credentials:0.9.0 ldap:2.7 lockable-resources:2.13 mailer:408.vd726a_1130320 matrix-auth:3.0.1 matrix-project:1.20 mattermost:3.1.1 metrics:4.0.2.8.1 momentjs:1.1.1 multibranch-action-triggers:1.8.6 pipeline-build-step:2.15 pipeline-graph-analysis:188.v3a01e7973f2c pipeline-input-step:446.vf27b_0b_83500e pipeline-milestone-step:1.3.2 pipeline-model-api:1.9.3 pipeline-model-definition:1.9.3 pipeline-model-extensions:1.9.3 pipeline-rest-api:2.21 pipeline-stage-step:291.vf0a8a7aeeb50 pipeline-stage-tags-metadata:1.9.3 pipeline-stage-view:2.21 plain-credentials:1.8 plugin-util-api:2.13.0 popper-api:1.16.1-2 popper2-api:2.11.2-1 prometheus:2.0.10 promoted-builds:3.11 scm-api:595.vd5a_df5eb_0e39 script-security:1131.v8b_b_5eda_c328e snakeyaml-api:1.29.1 sonar:2.14 sonar-quality-gates:1.3.1 ssh:2.6.1 ssh-agent:1.24.1 ssh-credentials:1.19 ssh-slaves:1.33.0 sshd:3.1.0 structs:308.v852b473a2b8c token-macro:267.vcdaea6462991 trilead-api:1.0.13 uno-choice:2.5.7 variant:1.4 workflow-aggregator:2.6 workflow-api:1136.v7f5f1759dc16 workflow-basic-steps:2.24 workflow-cps:2648.va9433432b33c workflow-cps-global-lib:552.vd9cc05b8a2e1 workflow-durable-task-step:1121.va_65b_d2701486 workflow-job:1167.v8fe861b_09ef9 workflow-multibranch:706.vd43c65dec013 workflow-scm-step:2.13 workflow-step-api:622.vb_8e7c15b_c95a_ workflow-support:813.vb_d7c3d2984a_0 ```

What Operating System are you using (both controller, and any agents involved in the problem)?

master running in Kubernetes using docker image jenkins/jenkins:2.332-jdk11 slaves running in Kubernetes using docker image 3.8.4-openjdk-11

Reproduction steps

Create a pipelineJob using CASC

pipelineJob('MyName') {
            parameters {
                stringParam('gitlabSourceBranch', '', 'Gitlab branch to build')
            }

            definition {
                cpsScm {
                    scm {
                        git {
                            remote {
                                name("origin")
                                url('git@git.url.net:namespace/project.git')
                                credentials('gitlab-deploy-key')
                                branch('$gitlabSourceBranch')
                            }
                        }
                        scriptPath('Jenkinsfile')
                    }
                }
            }

            logRotator {
              numToKeep(20)
              artifactNumToKeep(5)
            }
        }

Configure gitlab connection and triggering options using scripted Jenkinsfile

properties([
    gitLabConnection(gitLabConnection: 'git.url.com',
                     jobCredentialId: "gitlab-token-api",
                     useAlternativeCredential: true),
    pipelineTriggers([
        [
            $class: 'GitLabPushTrigger',
            branchFilterType: 'All',
            triggerOnPush: true,
            triggerOnMergeRequest: false,
            triggerOpenMergeRequestOnPush: "never",
            triggerOnNoteRequest: true,
            noteRegex: "Jenkins please retry a build",
            skipWorkInProgressMergeRequest: true,
            secretToken: project_token,
            ciSkip: false,
            setBuildDescription: true,
            addNoteOnMergeRequest: true,
            addCiMessage: true,
            addVoteOnMergeRequest: true
        ]
    ])
])

Expected Results

"Use alternative credential" should be checked and credential selected.
"Build when a change is pushed to GitLab." should be checked and requested options selected.

Actual Results

Checkboxes are not selected when reloading configuration in Manage Jenkins > Configuration as code > Reload existing configuration.

Anything else?

There is no log error related to this in jenkins logs (from Manage Jenkins nor from the container logs)
I have 2 jobs using the exact same configuration with the exact same symptoms
If I go afterward to the job, I can just select my gitlab credential in the list (the same one that is in the code), and manually select the triggering options, save, and they will remain selected until I reload the configuration.
project_token is define above in my Jenkinsfile

jenkinsci / gitlab-plugin