Steps to replicate the issue (include links if applicable):

• Create a story with the Story Builder
• Edit the story with the nojs form (add a single char to a frame text)

What happens?:

• if you look at the page history, the edit appears to have deleted a lot of bytes. Inspecting the json from the DB reveals that the 'originalText' fields are gone

What should have happened instead?:

• The edit from the form should have been merged with the existing content to preserve the original text that was selected from the article when the story was first created.

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):