HR is not your friend. HR is there to support the company. If you are not the company, they are not going to be there to support you. HR boils down to paid witnesses in some cases. It changes it from a "you said, the boss said" thing to two-on-one (or worse).
https://rachelbythebay.com/w/2021/01/17/woe/
https://rachelbythebay.com/w/2021/01/17/woe/