As I was aware of this bug on mobile but never got the chance to report it, I tried it again on PC.
Night 1 I attempted to kill the Poisoner, TriggerFingers. I expected the system to stop me from confirming with the message "You cannot attack fellow Coven members" as always but instead it allows the kill to be confirmed.
https://i.imgur.com/QcbLvWK.png
https://i.imgur.com/TFa1hNX.png
Night 3 I attempted to reveal the Poisoner again. I expected the system to stop me from doing so with the message "You already know their role", but instead it allows me to confirm the reveal action.
https://i.imgur.com/9sHwnf6.png
https://i.imgur.com/PvJ5xwF.png
Previously on mobile I have conducted a test with trusted friends to confirm that the kill and reveal CAN actually go through. If you still want screenshots of that, do tell me so I can provide them.