KHg8m3r, I'm replying from a different account because I forgot my password for QuiNews and Gmail is acting up and won't let me login, and also sorry for the late reply. Yes, I used the Flatpak version in Linux Mint, I didn't know that it being the Flatpak version could affect the graphics. I haven't tried building Dolphin myself because I find it kind of difficult, and I think the weird shadow isn't that big of a deal anyway. If it helps with anything, I tested the software renderer and the square shadow doesn't appear with it, but I noticed the background of the loading screens doesn't show up for some reason. These are the only errors I could find playing the game (I'm at 67% completion, the remaining missions are the hardest ones that I haven't beaten yet), I noticed there are some very specific "alpha blending" errors in certain objects throughout the game but they are present in console as well and sometimes my character will get a weird blue "tint" like as if he was being illuminated by a blue light, which I am not sure if it's present in console as I don't remember seeing it happen there but it also happens with the software renderer as well.
Here are some images:
https://imgur.com/a/z1kH6uI
The first one is showing an alpha blending issue that happens on console as well (look at the leaves, there are some other more noticeable alpha blending issues but this is the one that I managed to capture), the second one is showing the broken loading screen in the software renderer. I couldn't capture the blue tint issue I mentioned.
Here are some images:
https://imgur.com/a/z1kH6uI
The first one is showing an alpha blending issue that happens on console as well (look at the leaves, there are some other more noticeable alpha blending issues but this is the one that I managed to capture), the second one is showing the broken loading screen in the software renderer. I couldn't capture the blue tint issue I mentioned.