created user column not saving in O2M editor

[benhaynes]

From directus created by heho : directus/directus#2187

We manage our posts in channels where we collect the in a O2M relation.

Version Info

• Directus version and branch (Or commit hash): directus-build
• PHP version: 7.2.6
• MySQL version: 10.1.33-MariaDB
• Web server: Apache
• OS name and version: Windows 7

Expected Behavior

When editing a post from a channel and saving it a created user(we named it author) is the user that created it

Actual Behavior

it is NULL however the internal created by and modified values by seem to be intact

Steps to Reproduce

1. Create a table B with a column "user created" and a column for table B id
2. Create a table A with a M2O to table B
3. create a new row 1 in table A
4. from row create a new row 2 in table B and save it
5. save row 2, save row 1