frozen manifests cannot resolve $(MCU_CORE)

Likely needs an update of vendored tools/manifestfile.py > 13:57:53 | ℹ️ port-board: alif 13:57:53 | ❌ freeze error executing "D:\mypython\micropython-stubber\repos\micropython\ports\alif\boards\manifest.py": Error in manifest file: D:\mypython\micropython-stubber\repos\micropython\ports\alif\boards\manifest.py: [WinError 2] The system cannot find the file specified: 'D:\\mypython\\micropython-stubber\\repos\\micropython\\ports\\alif\\modules\\$(MCU_CORE)' 13:57:53 | ❌ Error processing manifest D:\mypython\micropython-stubber\repos\micropython\ports\alif\boards\manifest.py : Error in manifest file: D:\mypython\micropython-stubber\repos\micropython\ports\alif\boards\manifest.py: [WinError 2] The system cannot find the file specified: 'D:\\mypython\\micropython-stubber\\repos\\micropython\\ports\\alif\\modules\\$(MCU_CORE)'