I had to redownload 4 times xcode from the Mac App Store because any problem when downloading breaks it.

I think it's the last modern OS which can't resume downloads.

That is not an OS issue but an issue with the App Store. Also this is not true. I just tried it: https://youtu.be/Z6v1adrsqQM

I guess you have some kind of issue with your clock or io issues which corrupts the package. Are you using a vm?

No I was on real hardware, resuming with the button works but I guess it was cut in the middle by a wifi issue and in this case it just errors out.