Hello,
It's hard to say but if it's only showing up on a certain .NET/Windows combination and not either of those on other combinations, it probably isn't something we have control over since it's likely a low-level thing. You could try updating your display adapter drivers to the latest. Also I know Microsoft made improvements in window resizing rendering in more recent Windows 10 versions. As I'm writing this, I saw you sent other related support tickets in so I will reply further in those.