Images cropped and interface problems on non-16:9 screens

I'm pretty sure this bug isn't only for Onikakushi but I'm not sure where it would be better to report them. At very least, I'm reproducing them on Onikakushi here.

I'm comparing two systems, Linux running 2560x1600 (16:10) resolution and Windows running 2880x1920 (3:2) resolution. Latest steam version in both cases and latest releases of all the patches. I've installed all patches except for UI mod. I made screenshots on Linux PC here but the same problems exists on Windows system as well.

Problem 1: backgrounds are cropped in full-screen :( I expected black borders on top/bottom but the image is just cropped instead. UI is also cropped. I post here UI crop because screenshots are smaller but the same happens to any background
Window: 
Fullscreen: 

Problem 2: at very start, after the intro, there is vertical scroll of Hinamizawa. After that it's covered by black bars "cropping" the image. Well unfortunately they do that in wrong place and instead of crop you get ugly picture:

Now I installed UI mod. There are two problems, first is that buttons on the right are cropped and second is that "CLOSE" (and other text) doesn't fit the buttons. This happens both in window and fullscreen, though in fullscreen the interface is cropped even more due to problem 1. Window screenshots:

該 issue 描述了在非 16:9 長寬比下的渲染和 UI 縮放問題。查看 Unity 專案的 UI 畫布設定、相機視埠矩形和背景圖像縮放邏輯。UI mod 可能擁有自己的佈局元件。透過在不同解析度下執行遊戲並檢查開場捲動後的場景來測試更改。

由索引模型根據 Issue 內容生成。