Text format is not set when mapping to formatted text fields

When text field values are created for formatted text fields, the format attribute is left NULL.

I encountered this when mapping the Tweet Content property from the Twitter API to a formatted text field. The end result was that ampersands were left encoded, displayed as &. Setting the format directly in the database and clearing caches cause the text format to take effect. In my case this decoded the ampersand that was in the tweet.

My suggestion is to add an option in the field mapping UI to select a text format for formatted text fields.