https://i.imgur.com/N0DzMou.jpg
The amnesiac was on revealed to town and they became incense master.
2 Town Random can be Sheriff. Town Invest excludes Sheriff. There is also a confirmed Sheriff.
So the max count should be 3, it is instead 2.
There is no deceiver or whatever it is possible, and even if it was incense master already takes triad deception.
Dragon Head says max count: 1.