After some debugs in this file and Products/DCWorkflow/DCWorkflow.py.
I found after creation, the Knowledge state is already 'visible'
Maybe related to https://lab.nexedi.com/vpelletier/erp5/commit/59e7ed2946b612076ad21623f80c4e2f50f64199#diff-3
But not 100% sure. Wait Vincent confirm it.