I think dgyst told you trying to extract the arc, do not modifying anything, then repack to arc. Copy that arc file to the game to see if it is crashed.
Sorry for late response. Here is the .tex file I tried to mod for switch (already re-swizzling). Try it on your console to see if it work. I don't have that game so I'm unable to test.
Btw, may I know what is this tool?
I just use raw texture cooker to play around and unswizzle image. The Switch tex file has BC7, offset 0x18 and switch swizzle. The PC tex file has BC3, offset 0x24, no swizzled (of course).
I found someone asked the same question like you, to replace Switch texture with PC, you will need a...
@willbroficial yeah, my program only output if it find the correct hex string to replace; it will output nothing if the input files don't include correct hex string, this mean you don't have to convert these files to Switch.
@willbroficial Make sure you drop PC decypted files to the program. This is a standalone program, it can work without install anything. The output is the same location of the input files, with the new name *__modified.
@willbroficial To save the time, I created a program base on python to batch edit unity3d files, convert them from PC to Switch: download here. Remember it only works with decrypted unity3d files.