Custom screen image not working on 21:9 aspect ratio

[Aerograch]

Hello! I have been using your plugin for about 1 year, and it served me well. But, recently i have switch monitor from 1920x1080(16:9) to 3440x1440(21:9), and since then plugin fail to show any custom background image. Now it looks smth like this:

How to fix it?

[WesternGamer]

Does the issue cause custom background images to not show up at all? Also were you using custom backgrounds in the loading screen?

[Aerograch]

Yes, there were no custom background images at all. And, if i understood that correctly, yes, i was using 8 png's as custom background(well, i dropped them into "LoadingScreenBackgroundImages" folder as usual, and that did not caused them to appear as custom backgrounds)

[Aerograch]

Also, i have reloaded SE and my pc several times, just to be sure.

[Aerograch]

Update:
I aslo tried custom menu background - it worked, but aspect ratio is wrong. Original png is 3440x1440 but plugin compressed it to 2560x1440:

Original image:

[Codebreakerblue]

Same issue here. My monitor is 2560x1080, and custom menu images are squashed to fit a 16:9 aspect ratio (I think).
Screenshot:

Original image: