It happened yesterday on 4YA Project Overlord server, D9 without MW50, I did proper warmup, climb, cruise from Paris, engage 51, then RPM started fluctuating after I raised RPM from 3000 to 3250 around 8:01:41 in mission time. Temperature was fine whole time, raised just after failure, engine quit in 25s. Track is bigger than 50MB, so here is the link https://drive.google.com/file/d/1JbXpmJRTowXvQRre0oSOqb6Jr9LSepGS/view?usp=drive_link
I saw another posts here, but this happened without MW50 and without overheating engine.