SAB 9.0.1 MAC - PWA option problem

I have checked Include Progressive Web App in the HTML Export options, but now I cannot uncheck and also despite having checked it, it does not generate the files needed for PWA when I choose Export to HTML … strange !

I installed node and workbox and also used: npm cache clean -force
and then reinstalled workbox. But no change. I can not uncheck or check the box.

Work on latest BigSur!

I tried many things and in the end I could solve it by redoing the npm uncache and reinstall for the … time … and this time I found it work again. Grace, not works!