I don't think they are.
What they're told I think, as I was when I was a whistle-blower, was not to communicate with the person being investigated and suspended because it could prejudice the investigation. And not to speak to anyone outside of thise dealing with the investigation because again, it could prejudice the investigation.
Which is shit for them if the person accused is innocent and cut off from their colleagues or support network but at least they know there'll be an investigation and an end to it whether in their favour or not. And they are or should be, given support by managers and signposted to unions, legal help or other support services.
And when I was involved, it didn't seem at all to prevent the gossip and lies and people acting weird towards me even though no-one was supposed to know I was a whistle-blower .
And that was an official investigation where things had been formally reported.
I got a lot of fantastic advice on MN at the time and some, not so much lol.
That isn't the same as someone not being formally accused of something but being ostracised because of rumours or unreported allegations.