Xcode 10 Beta 4 CopyStrings --inputencoding utf-8 When File is utf-16

Just tried to build my project with the latest Xcode 10, Beta 4, and I'm getting CopyStrings failures. Xcode passes --inputencoding utf-8 for some reason whiltemy strings files have always been in utf-16. I tried converting them to utf-8 but the Xcode passes --inputencoding utf-16 for some of them. I can't seem to fully please Xcode 10 beta 4 no matter what encoding I use. Does anyone have a solution to this? I didn't find anywhere in Xcode in my project to specify the encoding of my strings files. Seems like Xcode should be able to automatically detect the encoding. I tried the usual clean build, option clean build and I even deleted the folder under DerivedData.