Chat messages not always displayed [CoD2 1.3]

[Dimitrio290]

For many years on my server, I notice that messages from other players are not always displayed in the chat.
If I use this code for example:

		codecallback_playercommand(args)
{
    if (args.size >= 2 && (args[0] == "say" || args[1] == "say_team") && isDefined(args[1]))
    {
        level thread playSoundOnPlayers("typewriter");
    }
    
    self clientCommand();
} 
	

then at such moments the sound is played and the message is not displayed.
I will clarify that the bug occurs without this code. Has anyone experienced this before and is there a solution?