The same thing had just happened to me and I have a screenshot of it.
https://i.imgur.com/dZXxW5Q.jpg
As you can see, the yellow "Message rejected for vulgarity" messages were clogging my chat so much, it interferes with the result of my investigation that night.
It is to note that the slew of messages only happened after Day 2, and stopped abruptly after I died.
My will also did not update itself past Day 2, despite me correctly closing it using the top-right button on the will.
I typed nothing with vulgar. My name and my will were also clean. Nothing like that happened before.
Before the game started, at the lobby, there were 2 people who typed demeaning slurs and vulgar words.
So I can't help but think I may have been hacked, but I can't be sure.
That is all for my complaint and information. Hope this issue gets resolved soon.