2021-08-24_GravUpgradeBlueprintIssue

Blueprint excerpt:

```
title: Home
'@extends':
    type: default
    context: blueprints://pages
form:
  fields:
    tabs:
      type: tabs
      active: 1

      fields:
        content:
          type: tab
          title: PLUGIN_ADMIN.CONTENT

          fields:
            header.fieldset_1:
              type: fieldset
              title: Column One
              icon: comments
              collapsed: false
              collapsible: true
              fields:
                header.column_1_title:
                  type: text
                  label: Title
                  default: 
                  validate:
                    type: text

                header.column_1_image:
                  name: column_1_image
                  type: file
                  label: Column 1 Image
                  destination: 'user/pages/01.home/column_images'
                  multiple: false
                  autofocus: false
                  accept:
                    - image/*

                header.column_1_content:
                    type: tinymce
                    label: Column 1 Content

            header.fieldset_2:
              type: fieldset
              title: Column Two
              icon: comments
              collapsed: false
              collapsible: true
              fields:
                header.column_2_title:
                  type: text
                  label: Title
                  default: 
                  validate:
                    type: text

                header.column_2_image:
                  name: column_2_image
                  type: file
                  label: Column 2 Image
                  destination: 'user/pages/01.home/column_images'
                  multiple: false
                  autofocus: false
                  accept:
                    - image/*

                header.column_2_content:
                    type: tinymce
                    label: Column 1 Content
```

Page header excerpt:

```
---
title: Home
media_order: 'apple-phone-touching.jpeg,white-pants-sitting.jpg,picnic-waterfront.jpg,cliff-edge-sunrise.jpg,woman-cloud-sunrise.jpg'
upcoming:
    column_1_title: 'Online: Week of August 16th'
    column_1_content: "<h3>Tuesday, August 17 &ndash; Off the Cushion</h3>\r\n<p><strong>Zoom session begins at 7:00 PM EST. Meditation starts at 7:15, with informal talk and discussion from 7:35 to 8:30.</strong></p>"
    column_2_content: "<p style=\"text-align: center;\"><img src=\"https://mcusercontent.com/b9d2b977643a4be7ba0fafdd9/images/d56361cf-f39b-abf3-a1f5-647c96bce950.jpeg\" alt=\"Image by Free-Photos from Pixabay\" width=\"500\" height=\"307\" /></p>"
```