My understanding is that this has been a known side effect of vaccines and reported by medical journals since 2021, even the WHO. I thought that is was a very low chance side effect (I think 1: 100,000 to 1:1,000,000 from earlier research, and the risk is offset by the reporting that covid itself has more chance of producing deadly blood clotting. Not sure if my memory if perfect but that was my understanding, so not sure why this is news?