Yes, specifically my tilemap file was using a unicode character that was not supported on my version of windows, and I was mounting it via samba to MacOS to build the cordova export.
Even though the original character was supported in MacOS, the windows encoding for an “unsupported” character is not a valid character in MacOS or iOS, so copying that file to either OS resulted in an “illegal character” error during the copy process (after building, which worked fine).
I renamed the tile map file and removed the unsupported character, and updated my code to remove the old resource reference, and pull from the newly named version instead.
This resolved my issue.
I’ve also updated my 
guide on how to build for iOS here: