This seems to be a UCRT bug:

https://developercommunity.visualstudio.com/content/problem/245451/unbuffered-console-io-is-broken-only-in-release-bu.html

On Thursday, May 24, 2018 at 2:38:12 PM UTC-4, Stefan wrote:
> Can reproduce the problem. But I haven't figured out why this happens yet:
> for some reason, the _getch() API call returns always zero after every key 
> typed. E.g. if you type 'q', then 'q' and '\0' is returned instead of just 
> 'q'.
> That's why it gets stuck in an endless loop (_getch() returning zero should 
> only happen for function and cursor keys according to the docs).
> 
> 
> So it might take me a while to figure this out...
> 
> 
> Stefan

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