Weird visual effect on Ultrawide monitor

[Alpac@]

I was a little bit frustrated playing MGSV with black bars on my 2560x1080 monitor, so I decided to use some hex editing magic to get rid of those. But I noticed this weird visual effect which is especially noticeable in the desert of Afghanistan. If you can see in the video, there is a rectangle in the middle of the screen where sand is flowing on the top of dunes, but outside of the rectangle there's no sand flow. Does anybody know how to fix that?
https://youtu.be/MMd5GGgoijs

[Lar Dass]

Thats because this game doesnt have widescreen support

[Alpac@]

Originally posted by Lar Dass:

Thats because this game doesnt have widescreen support

Yes, I know, but technically I only widened the game making it 2560 pixels wide, but 1080p remained the same. Then why is there no sand animation under and above the rectangle?

[Lar Dass]

Originally posted by Alexander the Alpaca:

Originally posted by Lar Dass:

Thats because this game doesnt have widescreen support

Yes, I know, but technically I only widened the game making it 2560 pixels wide, but 1080p remained the same. Then why is there no sand animation under and above the rectangle?

because the engine will bug out and your game would crash