The export/import system don't work if a table have a primary key string.
I have this schema :
Here is the result when I extract data with data-dump :
Then, I've got an error when I used data-load :
SQLSTATE: Integrity constraint violation: 1062 Duplicate entry '' for key 'PRIMARY'
The id column is empty is the DB.
It works if I add manually the id value in the yml file :