Hi , i have no idea ,
and i can't reproduce the issue again right now .
But about a week ago , malwarebytes browser extension blocked the Yahoo's main page when i visit ,
and warning it's a malware/scams website .....
When i saw malwarebytes browser extension blocked the tw.yahoo.com , i just add into the Allow list ,
so never see the FP again .
And few min ago , i remove the " tw.yahoo.com " from Allow list , but didn't see any warning message ,
seems no more FP issue .
malwarebytes browser extension had a update few days ago ,
maybe the issue had be fixed ?