The F-150 Lightning battery maker reportedly insists that the fire which forced Ford to halt production has been a one-off incident and not an inherent flaw in the manufacturing process that would require deeper investigation. SK On is increasingly worried that giving Ford more access to its battery technology may result in poaching it and go against the Korean government's trade secret guidelines for its EV industry.
https://www.notebookcheck.net/F-150-Lightning-production-restart-may-drag-as-Ford-battery-supplier-is-wary-of-industrial-espionage.696389.0.html
I personally have seen or heard about several instances where Ford has taken proprietary information from suppliers and given it to our preferred supplier. Those preferred suppliers now have former Ford managers on their staff as VPs and Engineering Directors.