I take it that since this post was from today and you described the same problem, you maybe had the same issue I have suddenly had — that unmodified sites suddenly don’t render with their CSS intact? They render without styling on (now current) version 102.3, at least on MacOS (ARM), which you also seem to be using.
Have you seen a thread about this? I spent several frustrating hours trying to chase down the problem, and it seemed to have something to do with permissions on style.css in my Public folder being set to Read Only every time I ran Hugo.
But I only resolved it for the time being thanks to these clear, super helpful instructions on downgrading from @bwintx . It worked for me to downgrade to version 100.3.