We have created approval process in Lightning on knowledge object, where Internal user will assign article to translators. Then translators will send article to Internal user for review and approval.
Currently Internal users are able to approve the translated records. But Internal users are unable to publish the translated records which is already approved.
Salesforce Classic Error:
The Translation was not published because of a conflict.
Salesforce Lightning error:
You can't perform this action. Be sure action is valid for the current state of the article.
Let us know if you have any ideas to overcome from this scenario.