Unapproved lubricant... well. Exactly the same, and also in throttle control input, caused (albeit together with software having problems handling the issue) a total control loss in Airbus A320, during a training flight in 2018 in Estonia. It resulted in a crash landing - they barely landed the plane in a way in which they could walk away from the landing, and the plane got destroyed.

Incident report: https://www.flightradar24.com/blog/wp-content/uploads/2019/1...

Also Mentour Pilot did a pretty good video explaining all causes, including the software issues: https://www.youtube.com/watch?v=04M63B1sv_Y