Hi I'm using Metabox AIO and Oxygen 3.1
On one of my websites I just migrated using your ACF migrator and new custom post migrator.
The migration went ok- but now Oxygen does not recognise Metabox fields in the Oxygen editor. This is an issue with your migrator since I've used Metabox in various websites before without issue.
I'll be sending login details for the affected website