Not able to generate core models for Apple Silicon devices

[vubui]

I follow the steps here: https://github.com/ggerganov/whisper.cpp#core-ml-support and ran

./models/generate-coreml-model.sh medium

I tried a few times and let it run for about 1 hour but the process typically hung at

Running MIL backend_mlprogram pipeline: 100%|██████████| 10/10 [00:00<00:00, 331.43 passes/s]

I don't know enough to dig into the root cause so am hoping someone could illuminate.