Netlify-cms: Required field notification appears even on successful save

[emckay]

Describe the bug

When I enter information in all required fields (including a date and markdown widget) and hit "publish", a toaster notification that says "Oops, you've missed a required field. Please complete before saving." appears, but the entry is still published.

To Reproduce

1. Click "create a new page"
2. Enter data in all fields
3. Click "publish" -> "publish now"
4. Observe toaster notification saying "Oops, you've missed a required field. Please complete before saving."

Expected behavior
I expect no toaster notification to appear.

Screenshots

Applicable Versions:

• Netlify CMS version: 2.2.0
• Git provider: BitBucket
• OS: Ubuntu
• Browser version: Chrome 61
  
• Node.JS version: 10.13.0

CMS configuration

backend:
  name: bitbucket
  repo: *omitted*

media_folder: static/assets
public_folder: assets

collections:
  - name: page
    label: Page
    folder: static/pages
    create: true
    fields:
      - { name: path, label: Path }
      - { name: date, label: Date, widget: date }
      - { name: body, label: Body, widget: markdown }

Additional context
Another user reported this on https://github.com/netlify/netlify-cms/issues/649

[karolis-sh]

I'm also having this issue (same version).

[barthc]

This issue is already fixed in #1887, it's just a typo.

[emckay]

Thanks. Searched issues, but didn't see any. Will close and hope for a publish soon :)