Project.yaml - Can't import saved single section

Description

It's probably linked with this issues #3872

The single section created in dev (my computer) can't be imported from production. But the information about the single section is saved in the project.yaml file and the save/import process worked without giving any warning or error.

Steps to reproduce

1. Create a single section (about page)
2. Save it
3. Commit & push
4. Pull on production
5. connect to the admin backend
6. Sync project.yaml successfully
7. Settings -> Section -> About page not found

Content of the project.yaml file after saving the single section :

  1110210f-c336-4d4e-aa58-b88e747c34da:
    enableVersioning: true
    entryTypes:
      fe082a7a-8fde-42e8-aa38-6109efd67d55:
        fieldLayouts:
          b115c8ed-5043-4c01-8948-cd7851450efd:
            tabs:
              -
                fields:
                  4250bd56-6e1e-4ae5-9e53-14ead835c56c:
                    required: false
                    sortOrder: 1
                  6feb4c57-b081-47d7-beb6-53ce856da249:
                    required: false
                    sortOrder: 2
                name: Body
                sortOrder: 1
        handle: aboutUs
        hasTitleField: false
        name: 'About Us'
        sortOrder: 1
        titleFormat: '{section.name|raw}'
        titleLabel: ''
    handle: aboutUs
    name: 'About Us'
    propagateEntries: true
    siteSettings:
      8411df7a-72da-4f34-b4b6-95239a01a4e6:
        enabledByDefault: true
        hasUrls: true
        template: about-us.twig
        uriFormat: about-us
      ac387b80-8f2a-46d0-b351-1cba39d94849:
        enabledByDefault: true
        hasUrls: true
        template: about-us.twig
        uriFormat: about-us
      af413f49-9077-448b-b89b-aaebfe1cd80b:
        enabledByDefault: true
        hasUrls: true
        template: about-us.twig
        uriFormat: about-us
    type: single

Additional info

• Craft version: 3.1.12
• PHP version: 7.1.22
• Database driver & version: MySQL 5.7.23
• Plugins & versions:

• Imager v2.1.4
• Migration Manager 3.0.17
• Redactor 2.3.1
• Super Table 2.1.8