Issue Summary

Since the rollout of the new collaborative editing services (NCS), pages are getting migrated, and in some cases, the migration is not successful which is causing the editor to not load properly.

We are seeing the following error in the network tab when the browser tries to call the following endpoint:

 /ccollab/document/

{
    "code": "PROSEMIRROR_SCHEMA_VALIDATION_ERROR",
    "message": "Prosemirror schema validation failed for node type: doc",
    "meta": "Failed to validate against the Prosemirror schema",
    "status": 400
} 

Steps to Reproduce

1. Visit one of the affected pages
2. Open edit mode

Expected Results

Drafts load fine

Actual Results

Drafts are not loading and edit mode is empty

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available