I think this has been happening for a while… but for whatever reason some of the networking packet simulation settings don’t seem to work anymore. My project currently has these in DefaultEngine.ini:
I am not having any issue here simulating packet loss. With that said, I am not using numbers anywhere as high as yours. As an example, here is the numbers I am using:
I think maybe the numbers you are using are simply too large. Let me know if you are still having issues when changing the numbers to something lower or if your issue persists through a new project.