The latest update added some modded weapons, including those from the TacZ mod. But when you shoot a modded weapon, the fireball sound plays.
Since I'm not very knowledgeable about modding, I have no suggestions for a solution. The only thing I noticed is that the reason for this error may be that the mod's shot sounds are in a folder with an unusual location and can't even be added with the /sound command.
I would be grateful if you could add the ability to use these custom shot sounds..