The newer and updated version on https://github.com/MeGaNeKoS/BetterDiscordPlugins/tree/main/FakeMuteDeafen

Allows you to talk while muted/deafened in Discord Voice Chat

0. ☆ Star this project (Highly Recommended) ;)
1. Enable Discord Developer Console (search it on google)
2. Ctrl + Shift + I and go to "Console" tab
   

3. Copy the code from code.js and execute in the console
   
4. Mute or deafen yourself.
5. Unmute and undeafen, you'll now be able to talk normally, while others will see you as muted and/or deafen
6. To revert it, you need to disconnect or move to other channel first, then come back.
7. Permanent revert? restart your discord or run this code WebSocket.prototype.send = WebSocket.prototype.original

There is 3 mode available for now, which is: 0 for allowing stuck on mute/deafen 1 for stuck on deafen only 2 for back to normal

To use it, just type mode = followed by the mode. e.g mode = 1.

Discord using WebSocket to send data. So, Here will decode the data if it an ArrayBuffer.
Next, it will check is there any self_mutes or self_deafen in the data.
If so, then if the value is true we forward the data to original WebSocket to tell the server we are on muted/deafened.

If the value false, it gonna check the guild_id is null or not. If it null, then it will forward the data to original WebSocket to tell the server we want to disconnect from voice channel. then we set the last_channel to null
if the data has guild id, then we check is the last_channel are in the data. If so, then we return. This data is the one will update our mute/deafen status. otherwise, we will forward all other data, and store the last channel.