Well tbh, when I was installing this ROM for the first time I didn't really know what I was doing and didn't have the PDF file with instructions (Tbh I still think installing sh*t on Android is true cancer, I'd compare it to doing anything with a broken printer). So at first I actually installed it with just TWRP and the wrong FlameGapps package, strangely enough, everything worked just fine. Then I realised I was supposed to install OrangeFox and a different FlameGapps package. So all I did was just flashing OrangeFox according to the PDF manual and then, correct FlameGapps and flashed again APK package of Magisk. Everything turned out well again. I guess I'm just lucky.
Just in case I can post my ZIP of files I used if it's allowed here on the forums, just let me know.