PluginDepndencies: version 5.14 or later of plugin 'cloudbees-folder' needs to be installed

[PavelKa]

Hello, I trying to use Your plugin to test jobDsl including folder creation. To simulate my issue I've extended example:
I've added dependency to :

pluginDependencies {   ...
    dependency("org.jenkins-ci.plugins", "pipeline-input-step", "2.8");
    dependency("org.jenkins-ci.plugins", "job-dsl", "1.77");
    dependency("org.jenkins-ci.plugins", "cloudbees-folder", "6.1.2");

I've added new test into VarsExampleJunitTest:

 //@WithPlugin("cloudbees-folder-6.1.2.hpi")
  @Test
  void "testing DSL folder"() {
    final CpsFlowDefinition flow = new CpsFlowDefinition('''
        node {
          jobDsl scriptText: "folder ('my folder')"
          echo 'hello stuff\'
        }
    '''.stripIndent(), true)
    final WorkflowJob workflowJob = rule.createProject(WorkflowJob, 'project')
    workflowJob.definition = flow
    rule.assertLogContains('hello stuff', rule.buildAndAssertSuccess(workflowJob))
  }
}

But when I run the test the following error occurs :

ERROR: (script, line 1) version 5.14 or later of plugin 'cloudbees-folder' needs to be installed

It looks that cloudbees folder plugin is not properly installed although job-dsl plugin works well.
I made a simple workaround using annotation @WithPlugin("cloudbees-folder-6.1.2.hpi") (plugin has to be placed in resource folder...) as You can see in the code above and then the test succeeded.
Any idea why the cloudbees-folder plugin installed using pluginDepndencies is not working ?
Or can You give me any advice how to investigate the problem?
Thanks' Pavel