I am in the wg14. But you should not thank me for those features. I'm not very happy with C23. We are working on making UB more understood, and to try to eliminate some UB.

To be clear: BSD was not breaking the standard, the standard didn't spell out what the correct action was. So different people had different interpretations. The standard states that things that aren't explicitly defined are UB, so one interpretation is that it was UB to begin with.