It can be simply reproduced by adding "import CreateML" to any Swift source file. I have attached an example to the FB.

Yes. edford's suggestion is correct about 13 beta 5 and 12.5.1 are the only options to build with CreateML. It also implies Apple should already have internal tracking for this.

The issue has been solved in Xcode 13.1. However, it brought another issue about undefined symbol. I will start another thread for it.