How can I avoid a ClasstCastException when when deserializing a nested Map containing a custom class using SnakeYaml?

Question

I am attempting to use SnakeYaml to deserialize an object into the correct Java object in Spring boot.

My Yaml looks like this:

workflows:
  flow1:
    firstPage:
      nextPages:
        - pageName: secondPage
    secondPage:
      nextPages:
        - pageName: thirdPage
  flow2:
    firstPage:
      nextPages:
        - pageName: fancyPage
    fancyPage:
      nextPages:

The object this yaml represents is: Map<String flowName, Map<String pageName, Class PageConfiguration>>

This data structure is a field (workflows) in class I have defined called ApplicationConfiguration.

PageConfiguration is a custom class that contains a single field of a custom class NextPage which is another class that contains a single field String pageName.

The object was originally just Map<String, PageConfiguration> and that deserialized fine, but I wanted to extend the functionality to allow for multiple flows hence the new Map<String, Map<String, PageConfiguration>> data structure.

The new nested data structure is throwing an ClassCastException error, cannot cast LinkedHashMap to PageConfiguration when I try to access the values contained within.

Here is my deserialization code: (note configPath is the correct path to the YAML file)

public ApplicationConfiguration getObject() {
    ClassPathResource classPathResource = new ClassPathResource(configPath);

    LoaderOptions loaderOptions = new LoaderOptions();
    loaderOptions.setAllowDuplicateKeys(false);
    loaderOptions.setMaxAliasesForCollections(Integer.MAX_VALUE);
    loaderOptions.setAllowRecursiveKeys(true);

    Yaml yaml = new Yaml(new Constructor(ApplicationConfiguration.class), new Representer(),
        new DumperOptions(), loaderOptions);
    ApplicationConfiguration appConfig = null;
    try {
      appConfig = yaml.load(classPathResource.getInputStream());
    } catch (IOException e) {
      e.printStackTrace();
    }

    return appConfig;
  }

And how I am attempting to access it when I get the ClassCastException:

public PageWorkflowConfiguration getPageWorkflow(String flowName, String pageName) {
    return this.workflows.get(flowName).get(pageName);
  }

It seems like the additional layer of nesting caused SnakeYaml to fail to deserialize correctly causing the ClassCastException error, cannot cast LinkedHashMap to PageConfiguration?